Insect sodium channels from insecticide-susceptible and insecticide-resistant house flies

ABSTRACT

The present invention is directed to isolated nucleic acid molecules encoding a voltage-sensitive sodium channel (VSSC) of  Musca domestica , the VSSC being capable of conferring insecticide susceptibility or insecticide resistance to  Musca domestica , as well as to the isolated voltage-sensitive sodium channels of  Musca domestica  encoded thereby. Nucleic acid molecules encoding insecticide susceptible VSSCs and nucleic acid molecules encoding insecticide resistant VSSCs are provided. Methods for increasing or decreasing the expression of functional voltage-sensitive sodium channels in host cells are also provided, as well as methods using the sodium channels. Also provided is a method for isolating other voltage-sensitive sodium channels.

This application is a divisional application of Ser. No. 08/772,512, filed on Dec. 24, 1996, now U.S. Pat. No. 6,022,705, issued on Feb. 8, 2000, which is a continuation-in-part of U.S. Ser. No. 08/608,618, filed Mar. 1, 1996, abandoned, the contents of which are hereby incorporated by reference.

The subject matter of this application was made with support from the United States Government under USDA Grant No. 94-37302-0408.

FIELD OF THE INVENTION

The present invention relates generally to insect sodium channel proteins, and more particularly to insecticide-susceptible and insecticide-resistant voltage-sensitive sodium channels of the house fly Musca domestica.

BACKGROUND OF THE INVENTION

Throughout this application various publications are referenced, many in parenthesis. Full citations for these publications are provided at the end of the Detailed Description. The disclosures of these publications in their entireties are hereby incorporated by reference in this application.

Cell membranes must allow passage of various polar molecules, including ions, sugars, amino acids, and nucleotides. Special membrane proteins are responsible for transferring such molecules across cell membranes. These proteins, referred to as membrane transport proteins, occur in many forms and in all types of biological membranes. Each protein is specific in that it transports a particular class of molecules (such as ions, sugars, or amino acids) and often only certain molecular species of the class. All membrane transport proteins that have been studied in detail have been found to be multipass transmembrane proteins. By forming a continuous protein pathway across the membrane, these proteins enable the specific molecules to cross the membrane without coming into direct contact with the hydrophobic interior of the lipid bilayer of the plasma membrane.

There are two major classes of membrane transport proteins: carrier proteins and channel proteins. Carrier proteins bind the specific molecule to be transported and undergo a series of conformational changes in order to transfer the bound molecule across he membrane. Channel proteins, on the other hand, need not bind the molecule. Instead, they form hydrophilic pores that extend across the lipid bilayer; when these pores are open, they allow specific molecules (usually inorganic ions of appropriate size and charge) to pass through them and thereby cross the membrane. Transport through channel proteins occurs at a much faster rate than transport mediated by carrier proteins.

Channel proteins which are concerned specifically with inorganic ion transport are referred to as ion channels, and include ion channels for sodium, potassium, calcium, and chloride ions. Ion channels which open in response to a change in the voltage across the membrane are referred to as voltage-sensitive ion channels.

The sodium channel is one of the most thoroughly characterized of the voltage-sensitive channels (see FIG. 1 for a model of a voltage-sensitive sodium channel). In vertebrates, sodium channels in the brain, muscle, and other tissues are large membrane glycoprotein complexes composed of an alpha subunit (230-270 kDa) and 1-2 tightly associated smaller (33-38 kDa) beta subunits (reviewed by Catterall 1992). The large alpha subunit forms the ion permeable pore while the smaller subunits play key roles in the regulation of channel function (Isom et al. 1992; reviewed by Isom et al. 1994). The alpha subunit is common to purified channel preparations from Electrophorus electricus (electric eel) electric organ (Noda et al. 1984), rat brain (Noda et al. 1986), rat skeletal muscle (Barchi 1988) and chick heart muscle (Catterall 1986). Other studies have revealed the existence of multiple closely related isoforms of the sodium channel found in different animal species, in different tissues within the same species, and even in the same tissue (Catterall et al. 1981; Frelin et al. 1984; Rogart 1986; Moczydlowski et al. 1986).

The structure of invertebrate sodium channels is not as well defined. Gene cloning studies have established the existence of alpha subunits of structure similar to those described for vertebrates (Loughney et al. 1989; Ramaswami and Tanouye 1989; Okamoto et al. 1987). Analysis of the para behavioral mutant (paralytic; Suzuki et al. 1971) of Drosophila melanogaster revealed that the para gene encodes a Drosophila sodium channel alpha subunit (Loughney et al. 1989). The entire para cDNA sequence was determined (Loughney et al. 1989; Thackeray and Ganetzky 1994).

The kdr mutant of the house fly Musca domestica has also been studied. The kdr insecticide resistance trait of the house fly confers reduced neuronal sensitivity to the rapid paralytic and lethal actions of DDT and pyrethroid insecticides (Soderlund and Bloomquist 1990). Because these insecticides are known to modify neuronal excitability by altering the inactivation kinetics of voltage-sensitive sodium channels (Soderlund and Bloomquist 1989; Bloomquist 1993), efforts to identify the molecular basis of kdr resistance have focused on the pharmacology and structure of this target.

Recently, tight genetic linkage between the kdr trait and a restriction fragment length polymorphism located within a segment of the house fly homolog of the para gene of Drosophila melanogaster was demonstrated (Knipple et al. 1994). Similar linkage studies have also documented tight linkage of the super-kdr resistance trait of the house fly (Williamson et al. 1993) to molecular markers lying within the para-homologous voltage-sensitive sodium channel gene.

Elucidation of the structure of the house fly sodium channel gene will enable the screening of potential insecticidal agents which act upon the sodium channel.

A need continues to exist, therefore, for the determination of the primary structure of the house fly sodium channel, i.e. the nucleotide and amino acid sequences of the channel.

SUMMARY OF INVENTION

To this end, the subject invention provides the 6318 nucleotide coding sequence (SEQ ID NO:1) of the voltage-sensitive sodium channel gene from insecticide-susceptible (NAIDM strain) house flies (Musca domestica), determined by automated direct DNA sequencing of PCR fragments obtained by amplification on first strand cDNA from adult heads. The deduced 2105-residue amino acid sequence (SEQ ID NO:3) exhibits overall structure and organization typical of sodium channel alpha subunit genes and is 90.0% identical to that of the D. melanogaster para gene product. There is no evidence for the existence of multiple splice variants among voltage-sensitive sodium channel cDNAs obtained from adult house fly head preparations. Comparison of the coding sequence of the voltage-sensitive sodium channel gene of the kdr insecticide-resistant house fly strain (538ge strain) to that of the NAIDM strain reveals 12 amino acid differences in the 538ge strain. The amino acid sequence (SEQ ID NO:4) of the Kdr strain is only 2104 residues in length, as a result of five (5) amino acid substitutions, four (4) amino acid deletions, and three (3) amino acid insertions as compared to the 2105-residue amino acid sequence (SEQ ID NO:3) of the NAIDM strain. The nucleotide sequence (SEQ ID NO:2) of the Kdr strain is therefore 6315 nucleotides in length, which is three nucleotides shorter than the nucleotide sequence (SEQ ID NO:1) of the NAIDM strain.

More particularly, the subject invention provides an isolated nucleic acid molecule encoding a voltage-sensitive sodium channel of Musca domestica, wherein the voltage-sensitive sodium channel is capable of conferring sensitivity or resistance to an insecticide in Musca domestica. In one embodiment, the nucleic acid molecule confers insecticide susceptibility to the house fly, and in another embodiment the nucleic acid molecule confers insecticide resistance to the house fly. The nucleic acid molecule conferring insecticide resistance is preferably a mutated form of the nucleic acid molecule encoding the insecticide susceptible channel. The invention also provides an antisense nucleic acid molecule complementary to mRNA encoding the voltage-sensitive sodium channel of Musca domestica.

The isolated nucleic acid molecules of the invention can be inserted into suitable expression vectors and/or host cells. Expression of the nucleic acid molecules encoding the sodium channels results in production of functional sodium channels in a host cell. Expression of the antisense nucleic acid molecules or fragments thereof in a host cell results in decreased expression of the functional sodium channels.

The invention further provides a ribozyme having a recognition sequence complementary to a portion of mRNA encoding a voltage-sensitive sodium channel of Musca domestica. The ribozyme can be introduced into a cell to also achieve decreased expression of sodium channels in the cell.

The invention further provides a method of screening a chemical agent for the ability of the chemical agent to modify sodium channel function, and a method of obtaining DNA encoding a voltage-sensitive sodium channel of Musca domestica.

Further provided is an isolated nucleic acid molecule encoding a voltage-sensitive sodium channel of an insect, wherein the nucleic acid molecule encodes a first amino acid sequence having at least 95% amino acid identity to a second amino acid sequence. The second amino acid sequence is, in two preferred embodiments, SEQ ID NO:3 or SEQ ID NO:4.

The invention also provides an isolated voltage-sensitive sodium channel of Musca domestica, and antibodies or antibody fragments specific for the sodium channel. The antibodies or antibody fragments can be used to detect the presence of the sodium channel in samples.

Further provided is an isolated voltage-sensitive sodium channel of Musca domestica, wherein the voltage-sensitive sodium channel is comprised of a protein having a first amino acid sequence with at least 95% amino acid identity to a second amino acid sequence. In two preferred embodiments, the second amino acid sequence is SEQ ID NO:3 or SEQ ID NO:4.

Also provided by the subject invention is a plasmid designated pPJI1 and deposited with the ATCC under Accession No. 97831, as well as a KpnI/AatII restriction fragment of about 3620 bp of the plasmid designated pPJI1. Further provided is a plasmid designated pPJI2 and deposited with the ATCC under Accession No. 97832, as well as an AatII/SphII restriction fragment of about 2700 bp of the plasmid designated pPJI2. When the above two restriction fragments are ligated together at their AatII sites, the resulting nucleic acid molecule encodes a voltage-sensitive sodium channel which confers susceptibility to an insecticide in Musca domestica. This resulting nucleic acid molecule is also provided by the subject invention.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features and advantages of this invention will be evident from the following detailed description of preferred embodiments when read in conjunction with the accompanying drawings in which:

FIG. 1 is a model of a voltage sensitive sodium channel from mammalian brain in the plasma membrane. The alpha and beta₁ subunits interact noncovalently; the alpha and beta₂ subunits are linked by disulfide bonds. The branched structures at the outer surface of the channel represent oligosaccharides;

FIG. 2 is a diagram of the structural organization of the voltage-sensitive sodium channel coding sequence of Musca domestica (Vssc1) showing repeated homology domains I-IV and putative transmembrane helices (rectangles). Shown below the structural organization are the relative length and location of the previously-described 309-nucleotide exon of Vssc1 (Knipple et al. 1994) (exon) and seven overlapping PCR-amplified cDNA fragments (A-G) employed as templates for DNA sequencing;

FIG. 3 shows the alignment of the predicted amino acid sequences of Vssc1^(NAIDM) (NAIDM) (SEQ ID NO:3) and Vssc1^(538ge) (538ge) (SEQ ID NO:4) with that of the a⁺b⁻c⁻d⁺e⁻f⁻h⁻i⁺ splice variant of the D. melanogaster para sequence (para) obtained using the DNASTAR computer program (Clustal method). Residues that are identical to the NAIDM sequence in both 538ge and para are indicated as dashes (−) in the latter two sequences; gaps introduced to obtain optimal alignment are indicated as periods (.). The locations of 24 putative helical transmembrane domains (e.g., IS1, IS2, etc.) and four putative pore-forming domains (e.g., IP, IIP) are marked by solid bars above the NAIDM sequence. Also marked above the NAIDM sequence are possible sites for N-linked glycosylation (#) cAMP-dependent protein kinase phosphorylation (*), and protein kinase C phosphorylation (); and

FIG. 4 is a diagram of the Vssc1 gene product showing the locations of 12 amino acid differences identified in the Vssc1^(538ge) sequence, including 5 amino acid substitutions, 4 amino acid deletions, and 3 amino acid insertions in the Vssc1^(538ge) sequence (R) as compared to the Vssc1^(NAIDM) sequence (S)

DETAILED DESCRIPTION

The plasmids designated pPJI1 and pPJI2 have each been deposited pursuant to, and in satisfaction of, the requirements of the Budapest Treaty on the International Recognition of the Deposit of Microorganisms for the Purposes of Patent Procedure, with the American Type Culture Collection (ATCC), 12301 Parklawn Drive, Rockville, Md., 20852 under ATCC Accession No. 97831 (pPJI1) and ATCC Accession No. 97832 (pPJI2). Both deposits were made on Dec. 20, 1996.

As used herein, the term “isolated” when used in conjunction with a nucleic acid molecule refers to: 1) a nucleic acid molecule which has been separated from an organism in a substantially purified form (i.e. substantially free of other substances originating from that organism), or 2) a nucleic acid molecule having the same nucleotide sequence but not necessarily separated from the organism (i.e. synthesized nucleic acid molecules). The term “isolated” when used in conjunction with a channel refers to a channel encoded by such an “isolated” nucleic acid molecule, generally expressed in a membrane, such as a plasma membrane within a cell or a synthetic lipid bilayer membrane. The expressed “isolated” channel has the pharmacological properties of a functional sodium channel.

As further used herein, the terms “corresponding to” or “having” or “as shown in” when used in conjunction with a SEQ ID NO for a nucleotide sequence refer to a nucleotide sequence which is substantially the same nucleotide sequence, or derivatives or equivalents thereof (such as deletion and hybrid variants thereof, splice variants thereof, etc.). Nucleotide additions, deletions, and/or substitutions, such as those which do not affect the translation of the DNA molecule, are within the scope of a nucleotide sequence corresponding to or having or as shown in a particular nucleotide sequence (i.e. the amino acid sequence encoded thereby remains the same). Such additions, deletions, and/or substitutions can be, for example, point mutations made according to methods known to those skilled in the art. It is also possible to substitute a nucleotide which alters the amino acid sequence encoded thereby, where the amino acid substituted is a conservative substitution or where amino acid homology is conserved. It is also possible to have minor nucleotide additions, deletions, and/or substitutions which do not alter the function of the resulting VSSC. Similarly, the term “corresponding to” or “having” or “as shown in” when used in conjunction with a SEQ ID NO for an amino acid sequence refers to an amino acid sequence which is substantially the same amino acid sequence or derivatives or equivalents thereof. Amino acid additions, deletions, and/or substitutions which do not negate the ability of the resulting protein to form a functional sodium channel are within the scope of an amino acid sequence corresponding to or having or as shown in a particular amino acid sequence. Such additions, deletions, and/or substitutions can be, for example, the result of point mutations in the DNA encoding the amino acid sequence, such point mutations made according to methods known to those skilled in the art. Substitutions may be conservative substitutions of amino acids. As used herein, two amino acid residues are conservative substitutions of one another where the two residues are of the same type. In this regard, for purposes of the present invention, proline, alanine, glycine, serine, and threonine, all of which are neutral, weakly hydrophobic residues, are of the same type. Glutamine, glutamic acid, asparagine, and aspartic acid, all of which are acidic, hydrophilic residues, are of the same type. Another type of residue is the basic, hydrophilic amino acid residues, which include histidine, lysine, and arginine. Leucine, isoleucine, valine, and methionine all of which are hydrophobic, aliphatic amino acid residues, form yet another type of residue. Yet another type of residue consists of phenylalanine, tyrosine, and tryptophan, all of which are hydrophobic, aromatic residues. Further descriptions of the concept of conservative substitutions are given by French and Robson 1983, Taylor 1986, and Bordo and Argos 1991.

As further used herein, the term “corresponding to” or “having” or “as shown in” or “consisting of” when used in conjunction with a SEQ ID NO for a nucleotide or amino acid sequence is intended to cover linear or cyclic versions of the recited sequence (cyclic referring to entirely cyclic versions or versions in which only a portion of the molecule is cyclic, including, for example, a single amino acid cyclic upon itself), and is intended to cover derivative or modified nucleotides or amino acids within the recited sequence. For example, those skilled in the art will readily understand that an adenine nucleotide could be replaced with a methyladenine, or a cytosine nucleotide could be replaced with a methylcytosine, if a methyl side chain is desirable. Nucleotide sequences having a given SEQ ID NO are intended to encompass nucleotide sequences containing these and like derivative or modified nucleotides, as well as cyclic variations. As a further example, those skilled in the art will readily understand that an asparagine residue could be replaced with an ethylasparagine if an ethyl side chain is desired, a lysine residue could be replaced with a hydroxylysine if an OH side chain is desired, or a valine residue could be replaced with a methylvaline if a methyl side chain is desired. Amino acid sequences having a given SEQ ID NO are intended to encompass amino acid sequences containing these and like derivative or modified amino acids, as well as cyclic variations. Cyclic, as used herein, also refers to cyclic versions of the derivative or modified nucleotides and amino acids.

The function of the encoded sodium channel can be assayed according to methods known in the art, such as by voltage clamp analysis of the channel following the functional expression of the channel in oocytes of the frog Xenopus laevis (see Taglialatela et al. 1992 and Stuhmer 1992 for a general discussion of the voltage clamp analysis of receptors and ion channels expressed in Xenopus oocytes). As used herein, “functional expression” refers to the synthesis and any necessary post-translational processing of a sodium channel molecule in a host cell so that the channel is inserted properly in the cell membrane and is capable of conducting sodium ions in response to an experimentally-imposed change in the cell membrane potential or upon exposure to appropriate pharmacological agents.

As further used herein, “sensitivity” and “resistance” refer to the relative responses of genetically-defined insect populations to the paralytic or lethal actions of a test insecticide. For example, a dose of DDT [1,1-bis-(4-chlorophenyl)-2,2,2-trichloroethane] of approximately 0.02 μg per adult fly will kill approximately 50 of the treated individuals of a susceptible (Cooper-S) house fly strain, whereas doses of approximately 0.5 μg per adult fly are required to kill approximately 50% of the treated individuals of a resistant (538ge) house fly strain (Sawicki 1978). The absolute doses that define susceptibility and resistance vary with the insect species and genetically defined populations examined, the test insecticide employed, and the method of exposure. In general, an insect strain or population is considered “resistant” if it exhibits tolerance to a test insecticide (assessed as the dose required to poison 50% of a treated population or group) that is at least 10 times greater than the tolerance of an appropriate reference, or “susceptible” population. Test insecticides include not only DDT but also analogs of DDT (e.g., methoxychlor, perthane) and pyrethroid insecticides (e.g., deltamethrin, fenvalerate, resmethrin, permethrin).

As also used herein, insects include Musca domestica (the house fly), the fruit or vinegar fly (Drosophila melanogaster), and various other insect species of agricultural, medical or veterinary importance, such as Heliothis virescens (the tobacco budworm) Leptinotarsa decemlineata (the Colorado potato beetle), Blattella germanica (the German cockroach), and Aedes aegypti (the yellow fever mosquito).

The subject invention provides an isolated nucleic acid molecule encoding a voltage-sensitive sodium channel (VSSC) of Musca domestica, wherein the VSSC is capable of conferring sensitivity or resistance to an insecticide in Musca domestica. The nucleic acid molecule can be deoxyribonucleic acid (DNA) or ribonucleic acid (RNA, including messenger RNA or mRNA), genomic or recombinant, biologically isolated or synthetic.

The DNA molecule can be a cDNA molecule, which is a DNA copy of a messenger RNA (mRNA) encoding the VSSC.

In one embodiment, the VSSC confers insecticide susceptibility to Musca domestica. An example of such an insecticide susceptible VSSC is the channel encoded by the nucleotide sequence as shown in SEQ ID NO:1. SEQ ID NO:1 is the DNA sequence of one allele of the VSSC of Musca domestica. The amino acid sequence encoded by this allele is shown in SEQ ID NO:3.

In another embodiment, the VSSC confers insecticide resistance to Musca domestica. An example of such an insecticide resistant VSSC is the channel encoded by the nucleotide sequence as shown in SEQ ID NO:2. SEQ ID NO:2 is the DNA sequence of another allele of the VSSC of Musca domestica characteristic of the kdr insecticide resistant strain. The amino acid sequence encoded by this mutant allele is shown in SEQ ID NO:4.

The insecticide resistant allele preferably has the nucleotide sequence of a second nucleic acid molecule with one or more mutations therein, wherein the second nucleic acid molecule encodes an insecticide sensitive VSSC and wherein one or more mutations in the second nucleic acid molecule render the resulting VSSC resistant to an insecticide (hence the term “mutant” allele) In one embodiment, the mutant allele (having amino acid SEQ ID NO:4) has the amino acid sequence encoded by the susceptibility allele (amino acid SEQ ID NO:3) with amino acid differences as follows: a substitution of phenylalanine for leucine at amino acid residue 1014 of SEQ ID NO:3; a substitution of isoleucine for methionine at amino acid residue 1140 of SEQ ID NO:3; a substitution of aspartic acid for glycine at amino acid residue 2023 of SEQ ID NO:3; a deletion of amino acid residues 2031-2034 of SEQ ID NO:3 (glycine-alanine-threonine-alanine); a substitution of threonine for serine at amino acid residue 2042 of SEQ ID NO:3; a substitution of alanine for valine at amino acid residue 2054 of SEQ ID NO:3; and an insertion of three amino acid residues (asparagine-glycine-glycine) after amino acid residue 2055 of SEQ ID NO:3 (between amino acid residues 2055 and 2056 of SEQ ID NO:3). One or more of these amino acid differences can be included in an insecticide resistant VSSC. Other suitable sites for mutations can be identified by conventional, molecular genetic approaches, such as the identification of amino acid sequence substitutions/insertions/deletions in the VSSC sequences of other insecticide-resistant house fly strains.

The invention also provides an antisense nucleic acid molecule that is complementary to the mRNA encoding the VSSC, or a fragment thereof. Antisense nucleic acid molecules can be RNA or single-stranded DNA. Antisense molecules can be complementary to the entire DNA molecule encoding the VSSC, i.e. of the same nucleotide length as the entire molecule. It may be desirable, however, to work with a shorter molecule. In this instance, fragments of the entire antisense molecule can be used. Suitable fragments are capable of hybridizing to the mRNA encoding the entire molecule, and preferably consist of at least twenty nucleotides. These antisense molecules and fragments thereof can be used to reduce steady state levels of a VSSC gene product of Musca domestica, by introducing into cells an RNA or single-stranded DNA molecule that is complementary to the mRNA of the VSSC (i.e. by introducing an antisense molecule). The antisense molecule can base-pair with the mRNA of the VSSC, preventing translation of the mRNA into protein. Thus, an antisense molecule to the VSSC of Musca domestica can prevent translation of mRNA encoding the VSSC into a functional sodium channel protein.

More particularly, an antisense molecule complementary to mRNA encoding a VSSC of Musca domestica, or a fragment thereof, can be used to decrease expression of a functional VSSC of Musca domestica. A cell with a first level of expression of a functional VSSC of Musca domestica is first selected, and then the antisense molecule (or fragment thereof) is introduced into the cell. The antisense molecule (or fragment thereof) blocks expression of functional VSSCs of Musca domestica, resulting in a second level of expression of a functional VSSC of Musca domestica in the cell. The second level is less than the initial first level.

Antisense molecules can be introduced into cells by any suitable means. Suitable cells include Xenopus oocytes which are useful host cells for studying the expression of the encoded sodium channel, and various insect cells, including but not limited to the insect cell lines Drosophila Schneider (Johansen et al. 1989), Drosophila K_(c) (Sang 1981), Sf9 (Smith et al. 1983), and High Five® (see U.S. Pat. No. 5,300,435). In one embodiment, the antisense RNA molecule is injected directly into the cellular cytoplasm, where the RNA interferes with translation. A vector may also be used for introduction of the antisense molecule into a cell. Such vectors include various plasmid and viral vectors. For a general discussion of antisense molecules and their use, see Han et al. 1991 and Rossi 1995.

The invention further provides a special category of antisense RNA molecules, known as ribozymes, having recognition sequences complementary to specific regions of the mRNA encoding the VSSC of Musca domestica. Ribozymes not only complex with target sequences via complementary antisense sequences but also catalyze the hydrolysis, or cleavage, of the template mRNA molecule. Examples, which are not intended to be limiting, of suitable regions of the mRNA template to be targeted by ribozymes are any of the regions encoding the 24 putative transmembrane domains of the VSSC of Musca domestica.

Expression of a ribozyme in a cell can inhibit gene expression (such as the expression of a VSSC of Musca domestica). More particularly, a ribozyme having a recognition sequence complementary to a region of a mRNA encoding a VSSC of Musca domestica can be used to decrease expression of a functional VSSC of Musca domestica. A cell with a first level of expression of a functional VSSC of Musca domestica is first selected, and then the ribozyme is introduced into the cell. The ribozyme in the cell decreases expression of a functional VSSC of Musca domestica in the cell, because mRNA encoding the VSSC is cleaved and cannot be translated.

Ribozymes can be introduced into cells by any suitable means. Suitable cells include Xenopus oocytes which are useful host cells for studying the expression of the encoded sodium channel, and various insect cells, including but not limited to the insect cell lines Drosophila Schneider, Drosophila K_(c), Sf9, and High Five®. In one embodiment, the ribozyme is injected directly into the cellular cytoplasm, where the ribozyme cleaves the mRNA and thereby interferes with translation. A vector may be used for introduction of the ribozyme into a cell. Such vectors include various plasmid and viral vectors (note that the DNA encoding the ribozyme does not need to be “incorporated” into the genome of the host cell; it could be expressed in a host cell infected by a viral vector, with the vector expressing the ribozyme, for instance). For a general discussion of ribozymes and their use, see Sarver et al. 1990, Chrisey et al. 1991, Rossi et al. 1992, and Christoffersen et al. 1995.

The nucleic acid molecules of the subject invention can be expressed in suitable host cells using conventional techniques. Any suitable host and/or vector system can be used to express the VSSCs. These include, but are not limited to, eukaryotic hosts such as mammalian cells (i.e., Hela cells, Cv-1 cells, COS cells), Xenopus oocytes, and insect cells (i.e. insect cell lines such as Drosophila Schneider, Drosophila K_(c), Sf9, and High Five®).

Techniques for introducing the nucleic acid molecules into the host cells may involve the use of expression vectors which comprise the nucleic acid molecules. These expression vectors (such as plasmids and viruses; viruses including bacteriophage) can then be used to introduce the nucleic acid molecules into suitable host cells. For example, sodium channel expression is often studied in Xenopus oocytes. DNA encoding the VSSC can be injected into the oocyte nucleus or transformed into the oocyte using a suitable vector, or mRNA encoding the VSSC can be injected directly into the oocyte, in order to obtain expression of a functional VSSC in the oocyte. It may be beneficial when expressing the sodium channels of the subject invention in Xenopus oocytes to coexpress a nucleic acid molecule encoding a tipE protein (Feng et al. 1995). Tip E has been found to be necessary to obtain expression of some sodium channels in Xenopus oocytes (Feng et al. 1995).

Various methods are known in the art for introducing nucleic acid molecules into host cells. One method is microinjection, in which DNA is injected directly into the nucleus of cells through fine glass needles (or RNA is injected directly into the cytoplasm of cells). Alternatively, DNA can be incubated with an inert carbohydrate polymer (dextran) to which a positively charged chemical group (DEAE, for diethylaminoethyl) has been coupled. The DNA sticks to the DEAE-dextran via its negatively charged phosphate groups. These large DNA-containing particles stick in turn to the surfaces of cells, which are thought to take them in by a process known as endocytosis. Some of the DNA evades destruction in the cytoplasm of the cell and escapes to the nucleus, where it can be transcribed into RNA like any other gene in the cell. In another method, cells efficiently take in DNA in the form of a precipitate with calcium phosphate. In electroporation, cells are placed in a solution containing DNA and subjected to a brief electrical pulse that causes holes to open transiently in their membranes. DNA enters through the holes directly into the cytoplasm, bypassing the endocytotic vesicles through which they pass in the DEAE-dextran and calcium phosphate procedures (passage through these vesicles may sometimes destroy or damage DNA). DNA can also be incorporated into artificial lipid vesicles, liposomes, which fuse with the cell membrane, delivering their contents directly into the cytoplasm. In an even more direct approach, used primarily with plant cells and tissues, DNA is absorbed to the surface of tungsten microprojectiles and fired into cells with a device resembling a shotgun.

Several of these methods, microinjection, electroporation, and liposome fusion, have been adapted to introduce proteins into cells. For review, see Mannino and Gould-Fogerite 1988, Shigekawa and Dower 1988, Capecchi 1980, and Klein et al. 1987.

Further methods for introducing nucleic acid molecules into cells involve the use of viral vectors. Since viral growth depends on the ability to get the viral genome into cells, viruses have devised clever and efficient methods for doing it. One such virus widely used for protein production is an insect virus, baculovirus. Baculovirus attracted the attention of researchers because during infection, it produces one of its structural proteins (the coat protein) to spectacular levels. If a foreign gene were to be substituted for this viral gene, it too ought to be produced at high level. Baculovirus, like vaccinia, is very large, and therefore foreign genes must be placed in the viral genome by recombination. To express a foreign gene in baculovirus, the gene of interest is cloned in place of the viral coat protein gene in a plasmid carrying a small portion of the viral genome. The recombinant plasmid is cotransfected into insect cells with wild-type baculovirus DNA. At a low frequency, the plasmid and viral DNAs recombine through homologous sequences, resulting in the insertion of the foreign gene into the viral genome. Virus plaques develop, and the plaques containing recombinant virus look different because they lack the coat protein. The plaques with recombinant virus are picked and expanded. This virus stock is then used to infect a fresh culture of insect cells, resulting in high expression of the foreign protein. For a review of baculovirus vectors, see Miller (1989). Various viral vectors have also been used to transform mammalian cells, such as bacteriophage, vaccinia virus, adenovirus, and retrovirus.

As indicated, some of these methods of transforming a cell require the use of an intermediate plasmid vector. U.S. Pat. No. 4,237,224 to Cohen and Boyer describes the production of expression systems in the form of recombinant plasmids using restriction enzyme cleavage and ligation with DNA ligase. These recombinant plasmids are then introduced by means of transformation and replicated in unicellular cultures including procaryotic organisms and eucaryotic cells grown in tissue culture. The DNA sequences are cloned into the plasmid vector using standard cloning procedures known in the art, as described by Sambrook et al. (1989).

Host cells into which the nucleic acid encoding the VSSC has been introduced can be used to produce (i.e. to functionally express) the voltage-sensitive sodium channel.

Having identified the nucleic acid molecules encoding VSSCs and methods for expressing functional channels encoded thereby, the invention further provides a method of screening a chemical agent for the ability of the chemical agent to modify sodium channel function. The method comprises introducing a nucleic acid molecule encoding the VSSC into a host cell, and expressing the VSSC encoded by the molecule in the host cell. The expression results in the functional expression of a VSSC in the membrane of the host cell. The cell is then exposed to a chemical agent and evaluated to determine if the chemical agent modifies the function of the VSSC. From this evaluation, chemical agents effective in altering the function of the sodium channel can be found. Such agents may be, for example, tetrodotoxin, veratridine, and scorpion venom toxins. Additional agents can be found in Soderlund and Knipple 1994.

Cells transformed to include the VSSC according to the subject invention can be exposed to various potential insecticides and pesticides and evaluated for their susceptibility to the agents to develop and identify insect control agents that will not cause adverse effects to vertebrate species. Exemplary methods of screening are described in Eldefrawi et al. 1987 and Rauh et al. 1990. The evaluation of the function of the sodium channel can be by any means known in the art. In one embodiment, the evaluation comprises monitoring sodium transport through the VSSC. Sodium transport can be monitored by pre-incubating cells in a medium containing one or more chemical agents, adding a medium containing radiosodium (²²Na⁺), incubating the cells further in this medium, and isolating cells by filtration. Sodium transport is detected by the measurement of ²²Na⁺ within the cells by liquid scintillation counting or other radiometric techniques (Bloomquist and Soderlund 1988). Alternatively, [¹⁴C]guanidinium ion can be employed as the radiotracer in the place of sodium using the same procedure (Jacques et al. 1978). In another embodiment, the function of the VSSC can be evaluated by pre-incubating cells to equilibrium with a sodium-selective fluorescent chelating agent (e.g., SBFI [sodium-binding benzofuran isophthalate]), washing the cells, exposing the cells to a test agent, and monitoring the increase in intracellular sodium by measuring the fluorescence of the SBFI-sodium complex (Deri and Adam-Vizi 1993).

The nucleic acid molecules of the subject invention can be used either as probes or for the design of primers to obtain DNA encoding other VSSCs by either cloning and colony/plaque hybridization or amplification using the polymerase chain reaction (PCR).

Specific probes derived from SEQ ID NOs 1 or 2 can be employed to identify colonies or plaques containing cloned DNA encoding a member of the VSSC family using known methods (see Sambrook et al. 1989). One skilled in the art will recognize that by employing such probes under high stringency conditions (for example, hybridization at 42° C. with 5×SSPC and 50% formamide, washing at 50-65° C. with 0.5×SSPC), sequences having regions which are greater than 90% identical to the probe can be obtained. Sequences with lower percent identity to the probe, which also encode VSSCs, can be obtained by lowering the stringency of hybridization and washing (for example, by reducing the hybridization and wash temperatures or reducing the amount of formamide employed).

More particularly, in one embodiment, the method comprises selection of a DNA molecule encoding a VSSC of an insect, or a fragment thereof, the DNA molecule having a nucleotide sequence selected from the group consisting of SEQ ID NO:1 and SEQ ID NO:2, and designing an oligonucleotide probe for a VSSC based on SEQ ID NO:1 or SEQ ID NO:2. A genomic or cDNA library of an insect is then probed with the oligonucleotide probe, and clones are obtained from the library that are recognized by the oligonucleotide probe so as to obtain DNA encoding another VSSC.

Specific primers derived from SEQ ID NOs 1 or 2 can be used in PCR to amplify a DNA sequence encoding a member of the VSSC family using known methods (see Innis et al. 1990). One skilled in the art will recognize that by employing such primers under high stringency conditions (for example, annealing at 50-60° C., depending on the length and specific nucleotide content of the primers employed), sequences having regions greater than 75% identical to the primers will be amplified.

More particularly, in a further embodiment the method comprises selection of a DNA molecule encoding a VSSC of an insect, or a fragment thereof, the DNA molecule having a nucleotide sequence selected from the group consisting of SEQ ID NO:1 and SEQ ID NO:2, designing degenerate oligonucleotide primers based on regions of SEQ ID NO:1 or SEQ ID NO:2, and employing such primers in the polymerase chain reaction using as a template a DNA sample to be screened for the presence of VSSC-encoding sequences. The resulting PCR products can be isolated and sequenced to identify DNA fragments that encode polypeptide sequences corresponding to the targeted region of a VSSC.

Various modifications of the nucleic acid and amino acid sequences disclosed herein are covered by the subject invention. These varied sequences still encode a functional VSSC. The invention thus further provides an isolated nucleic acid molecule encoding a VSSC of an insect, the nucleic acid molecule encoding a first amino acid sequence having at least 95% amino acid identity to a second amino acid sequence, the second amino acid sequence being as shown in SEQ ID NO:3. The resulting encoded VSSC is susceptible to an insecticide. The invention also provides an isolated nucleic acid molecule encoding a VSSC of an insect, the nucleic acid molecule encoding a first amino acid sequence having at least 95% amino acid identity to a second amino acid sequence, the second amino acid sequence being as shown in SEQ ID NO:4. The resulting VSSC is resistant to an insecticide.

The invention further provides isolated voltage-sensitive sodium channels of Musca domestica, wherein the VSSC is capable of conferring sensitivity or resistance to an insecticide in Musca domestica. In one embodiment, the VSSC confers susceptibility to an insecticide in Musca domestica, such as the VSSC encoded by the nucleotide sequence as shown in SEQ ID NO:1 (which encodes an amino acid sequence as shown in SEQ ID NO:3) In a further embodiment, the VSSC confers resistance to an insecticide in Musca domestica, such as the VSSC encoded by the nucleotide sequence as shown in SEQ ID NO:3 (which encodes an amino acid sequence as shown in SEQ ID NO:4) Preferably, the insecticide resistant VSSC is encoded by a nucleic acid molecule having the nucleotide sequence of a second nucleic acid molecule with one or more mutations therein, wherein the second nucleic acid molecule encodes an insecticide sensitive VSSC, and wherein the one or more mutations in the second nucleic acid molecule render the resulting voltage-sensitive sodium channel resistant to an insecticide. For example, the nucleotide sequence of the second nucleic acid molecule may encode amino acid SEQ ID NO:3, and the insecticide resistant VSSC may have that amino acid sequence with one or more differences therein as follows: a substitution of phenylalanine for leucine at amino acid residue 1014 of SEQ ID NO:3; a substitution of isoleucine for methionine at amino acid residue 1140 of SEQ ID NO:3; a substitution of aspartic acid for glycine at amino acid residue 2023 of SEQ ID NO:3; a deletion of amino acid residues 2031-2034 of SEQ ID NO:3 (glycine-alanine-threonine-alanine); a substitution of threonine for serine at amino acid residue 2042 of SEQ ID NO:3; a substitution of alanine for valine at amino acid residue 2054 of SEQ ID NO:3; and an insertion of three amino acid residues (asparagine-glycine-glycine) after amino acid residue 2055 of SEQ ID NO:3 (between amino acid residues 2055 and 2056 of SEQ ID NO:3).

A variety of methodologies known in the art can be utilized to obtain an isolated VSSC according to the subject invention. In one method, the channel protein is purified from tissues or cells which naturally produce the channel protein. One skilled in the art can readily follow known methods for isolating proteins in order to obtain a member of the VSSC protein family, free of natural contaminants. These include, but are not limited to, immunochromatography, HPLC, size-exclusion chromatography, ion-exchange chromatography, and immunoaffinity chromatography. In another embodiment, a member of the VSSC family can be purified from cells which have been altered to express the channel protein. As used herein, a cell is said to be “altered to express the channel protein” when the cell, through genetic manipulation, is made to produce the channel protein which it normally does not produce or which the cell normally produces at low levels. One skilled in the art can readily adapt procedures for introducing and expressing either genomic, cDNA or synthetic sequences into either eukaryotic or prokaryotic cells in order to generate a cell which produces a member of the VSSC family utilizing the sequences disclosed herein.

A VSSC as defined herein includes molecules encoding VSSCs encoded by an amino acid sequence having at least 95% amino acid identity to SEQ ID NO:3 or to SEQ ID NO:4.

Antibodies can be raised to the voltage-sensitive sodium channel. Antibodies of the subject invention include polyclonal antibodies and monoclonal antibodies capable of binding to the channel protein, as well as fragments of these antibodies, and humanized forms. Humanized forms of the antibodies of the subject invention may be generated using one of the procedures known in the art such as chimerization. Fragments of the antibodies of the present invention include, but are not limited to, the Fab, the Fab2, and the Fd fragments.

The invention also provides hybridomas which are capable of producing the above-described antibodies. A hybridoma is an immortalized cell line which is capable of secreting a specific monoclonal antibody.

In general, techniques for preparing polyclonal and monoclonal antibodies as well as hybridomas capable of producing the desired antibody are well known in the art (see Campbell 1984 and St. Groth et al. 1980). Any animal (mouse, rabbit, etc.) which is known to produce antibodies can be immunized with the antigenic channel protein (or an antigenic fragment thereof). Methods for immunization are well known in the art. Such methods include subcutaneous or intraperitoneal injection of the protein. One skilled in the art will recognize that the amount of the channel protein used for immunization will vary based on the animal which is immunized, the antigenicity of the protein, and the site of injection.

The protein which is used as an immunogen may be modified or administered in an adjuvant in order to increase the protein's antigenicity. Methods of increasing the antigenicity of a protein are well known in the art and include, but are not limited to, coupling the antigen with a heterologous protein (such as a globulin or beta-galactosidase) or through the inclusion of an adjuvant during immunization.

For monoclonal antibodies, spleen cells from the immunized animals are removed, fused with myeloma cells, such as SP2/O-Ag 15 myeloma cells, and allowed to become monoclonal antibody producing hybridoma cells.

Any one of a number of methods well known in the art can be used to identify the hybridoma cell which produces an antibody with the desired characteristics. These include screening the hybridomas with an ELISA assay, western blot analysis, or radioimmunoassay (Lutz et al. 1988).

Hybridomas secreting the desired antibodies are cloned and the class and subclass are determined using procedures known in the art (Campbell 1984).

For polyclonal antibodies, antibody containing antisera is isolated from the immunized animal and is screened for the presence of antibodies with the desired specificity using one of the above-described procedures.

The present invention further provides the above-described antibodies in detectably labeled form. Antibodies can be detectably labeled through the use of radioisotopes, affinity labels (such as biotin, avidin, etc.), enzymatic labels (such as horseradish peroxidase, alkaline phosphatase, etc.), fluorescent labels (such as FITC or rhodamine, etc.), paramagnetic atoms, etc. Procedures for accomplishing such labeling are well known in the art, for example see Sternberger et al. 1970, Bayer et al. 1979, Engval et al. 1972, and Goding 1976.

The labeled antibodies or fragments thereof of the present invention can be used for in vitro, in vivo, and in situ assays to identify cells or tissues which express a VSSC, to identify samples containing the VSSC proteins, or to detect the presence of a VSSC in a sample. More particularly, the antibodies or fragments thereof can thus be used to detect the presence of a VSSC in a sample, by contacting the sample with the antibody or fragment thereof. The antibody or fragment thereof binds to any VSSC present in the sample, forming a complex therewith. The complex can then be detected, thereby detecting the presence of the VSSC in the sample.

Fragments of the nucleic acid molecules encoding a VSSC are also provided, and are best defined in the context of amino acid sequence relationships among members of the VSSC sequence family and information on the function of specific VSSC domains. For example the amino acid sequence encoded by nucleotides 4648-4803 of SEQ ID NOs 1 or 2 encodes an amino acid sequence that is highly conserved among VSSC family members and is identified as the structural component forming the “inactivation gate” of sodium channels. Antibodies prepared to the polypeptide encoded by this fragment would therefore be expected to be of use as reagents capable of detecting many members of the VSSC family. Such antibodies, if introduced into cells that express VSSCs, would also be expected to modify the normal function of the VSSCs expressed in those cells. In contrast, the amino acid sequence encoded by nucleotides 3079-3852 of SEQ ID NOs 1 or 2 encodes an amino acid sequence that is less well conserved between the VSSCs of the insects Musca domestica and Drosophila melanogaster. Antibodies prepared to the polypeptide encoded by this fragment would therefore be expected to recognize selectively the VSSC from which the fragment was derived.

Also provided by the subject invention is a plasmid designated pPJI1 and deposited with the ATCC under Accession No. 97831, as well as a KpnI/AatII restriction fragment of about 3620 bp of the plasmid designated pPJI1. Further provided is a plasmid designated pPJI2 and deposited with the ATCC under Accession No. 97832, as well as an AatII/SphII restriction fragment of about 2700 bp of the plasmid designated pPJI2. When the above two restriction fragments are ligated together at their AatII sites, the resulting nucleic acid molecule encodes a voltage-sensitive sodium channel which confers susceptibility to an insecticide in Musca domestica. This resulting nucleic acid molecule is also provided by the subject invention.

MATERIALS AND METHODS

Heads of newly-emerged adult house flies (NAIDM or 538ge strain) (Knipple et al. 1994) were ground to a fine powder under liquid N₂ and extracted with acid guanidinium isothiocyanate/phenol/chloroform to obtain total RNA (Chomczynski and Sacchi 1987), which was fractionated on oligo(dT)-paramagnetic beads (PolyATtract mRNA isolation system; Promega, Madison, Wis.) to obtain poly(A⁺) RNA. Pools of first strand cDNA were synthesized using either random hexamers (Harvey and Darlison 1991) or oligo(dT) adapted for the 3′-RACE procedure (Frohman and Martin 1989). These cDNA pools were employed as templates in the polymerase chain reaction (PCR) (Saiki et al. 1988) to amplify overlapping cDNA segments spanning the entire Vssc1 coding sequence. Mixed-sequence oligonucleotide primers employed for these amplifications comprised all possible sequence combinations encoding short (i.e., 6-8 residues) regions of amino acid conservation between the para gene of D. melanogaster and rat brain sodium channel I (Loughney et al. 1989; Knipple et al. 1991). In a few cases, mixed-sequence primers were based solely on the D. melanogaster sequence. Defined-sequence primers were derived either from the previously described 309-nucleotide exon of the house fly Vssc1 gene (Knipple et al. 1994) or from internal sequences of house fly cDNA fragments obtained by amplification with mixed-sequence primers. All primers were synthesized using an Applied Biosystems 392 instrument, deprotected using procedures provided by Applied Biosystems, desalted, and used without further purification. The sequences and designations of these primers are given in Table I. The methods and reagents employed in PCR amplifications are described elsewhere (Knipple et al. 1991; Henderson et al. 1994; Knipple et al. 1994); specific amplification conditions for each cDNA fragment were optimized by varying the annealing temperatures and extension times of the reaction. Following amplification, PCR products were separated from excess primers either by filtration of the reaction mixture through a Centricon-100 concentrator (Amicon, Beverly, Mass.) or by preparative electrophoresis on agarose gels, excision of the desired product, and extraction from the gel matrix (QIAquick spin column; Qiagen, Chatsworth, Calif.) prior to use as templates for DNA sequencing.

The DNA sequences of amplified cDNA fragments were determined by automated sequencing with an Applied Biosystems 373 instrument using fluorescently-labeled dideoxynucleotides and Taq DNA polymerase (PCR/Sequencing Kit; Applied Biosystems, Foster City, Calif.) in a modification of the dideoxynucleotide chain-termination method (Sanger et al. 1977). Sequencing of each amplification product was initiated by using the amplification primers to sequence inward from the termini, and additional primers were synthesized as needed to obtain the complete sequence of each strand. Mixed-sequence amplification primers were employed for sequencing at concentrations 10-fold higher than that used for defined-sequence primers. All sequence ambiguities and apparent polymorphisms were resolved by performing additional multiple sequencing reactions. The full-length Vssc1 coding sequences from the NAIDM and 538ge strains were compiled from 239 and 209 individual sequencing reactions, respectively, and were edited using the SeqEd software program (Applied Biosystems). Complete house fly Vssc1 sequences were analyzed and compared with published sodium channel sequences using the DNASTAR software package (DNASTAR, Madison, Wis.).

EXAMPLE I Sequencing of the Insecticide Sensitive Vssc of House Fly

As an expedient alternative to conventional iterative screenings of cDNA libraries, a sequencing strategy for the house fly Vssc1 gene was based on the PCR amplification and direct automated sequencing of overlapping cDNA fragments (FIG. 2). The point of entry for this strategy was the 309-nucleotide exon of the house fly Vssc1 gene identified previously from sequencing of cloned genomic DNA (Knipple et al. 1994). The use of defined-sequence primers from this region (Table I, A1 or B2) in combination with mixed-sequence primers encoding conserved amino acid sequences in either region IIS3 (A2) or the extracellular N-terminal domain (B1) gave cDNA fragments A and B. A second point of entry was established in homology domain IV using a pair of mixed-sequence primers (C1 and C2) to obtain fragment C. A primer (D2) designed from the internal sequence of fragment C, together with a mixed-sequence primer (D1) encoding a conserved amino acid motif in the short linker between homology domains III and IV, gave fragment D. A pair of defined-sequence primers (E1, E2) based on internal sequences of fragments A and D gave the large fragment E, which spanned most of homology domain II and all of homology domain III. Fragment F, corresponding to the 5′ end of the coding sequence, was obtained using a defined-sequence primer (F2) derived from the internal sequence of fragment B and a mixed-sequence primer (F1) derived from a segment of the D. melanogaster sequence upstream from the translation start site (Loughney et al. 1989). Similarly, fragment G, containing the 3′ end of the coding sequence, was obtained using a defined-sequence primer (G1) derived from the internal sequence of fragment C and a mixed-sequence primer (G2) derived from a segment of the D. melanogaster sequence downstream from the stop codon (Thackeray and Ganetzky 1994).

The complete coding sequence of the Vssc1^(NAIDM) allele of the house fly, comprising a single open reading frame of 6318 nucleotides (SEQ ID NO:1), was determined by automated DNA sequencing using cDNA fragments A-G as templates (FIG. 2). This cDNA coded for a 2105-amino acid polypeptide (SEQ ID NO:3) with a predicted molecular weight of 236,671 Daltons that exhibited all of the common structural landmarks found in sodium channel a subunit genes (Catterall 1992; Kallen et al. 1993) (see FIG. 3) including four large internally homologous subdomains (I-IV), each containing six hydrophobic putative transmembrane helices (S1-S6) and a conserved sequence element between domains S5 and S6 identified as an ion pore-forming domain. The deduced Vssc1^(NAIDM) amino acid sequence also contained a conserved element in the S4 region of each homology domain, characterized by a repeated motif of positively-charged amino acids that are thought to form the voltage-sensing element of the channel, and a short segment of conserved sequence between homology domains III and IV that has been identified as the channel inactivation gate (see FIG. 3). The deduced Vssc1^(NAIDM) protein contained 10 potential sites for N-linked glycosylation (Kornfeld and Kornfeld 1985), 6 of which occur in putative extracellular regions. These regions of other sodium channel a subunit sequences are also known to contain potential glycosylation sites (Catterall 1992; Kallen et al. 1993).

Vertebrate sodium channels are known to undergo functional regulation as the result of phosphorylation by cAMP-dependent protein kinases at sites in the intracellular linker between homology domains I and II and by protein kinase C at a site in the intracellular linker between homology domains III and IV (Catterall 1992; Kallen et al. 1993). The deduced Vssc1^(NAIDM) protein contained three potential cAMP-dependent protein kinase phosphorylation sites (Kemp and Pearson 1990) (Ser540, Ser557, and Ser628) in the cytoplasmic linker between homology domains I and II. The location of two of these (Ser540 and Ser557 of SEQ ID NO:3) corresponded to the cluster of four sites found in this region of vertebrate brain sodium channels that are implicated in sodium channel regulation (Catterall 1992). The deduced Vssc1^(NAIDM) protein also contained three additional potential phosphorylation sites (Ser1167, Ser1207, and Ser2097 of SEQ ID NO:3) in other putative intracellular domains. The role of these phosphorylation sites in the regulation of insect sodium channels by cAMP-dependent protein kinase is not known. The deduced house fly voltage-sensitive sodium channel protein also contained two potential sites for protein kinase C phosphorylation (Ser1191 and Ser1582 of SEQ ID NO:3) (Kemp and Pearson 1990), the latter of which is the conserved site located within the inactivation gate sequence of the cytoplasmic linker between domains III and IV. Although the conservation of this site implicates a role for protein kinase C in the regulation of insect sodium channels, such an effect has not been demonstrated experimentally.

The deduced Vssc1^(NAIDM) protein was 90.0% identical to the most similar variant of the para gene product of D. melanogaster (SEQ ID NO:19) (Loughney et al. 1989; Thackeray and Ganetzky 1994) (FIG. 3). The level of sequence identity was highest (≧95%) in the N-terminal intracellular domain, the linker between homology domains III and IV, and homology domain IV. The level of sequence identity was lowest (73%) in the intracellular C-terminal domain. Alignment of the Vssc1 sequence with 12 other sodium channel α subunit sequences found in the GenBank database showed that the Vssc1 and para gene products exhibited approximately the same degree of sequence similarity as homologous sodium channel a subunit isoforms from different vertebrate species. These findings confirm and extend previous observations (Williamson et al. 1993; Knipple et al. 1994), based on fragmentary genomic DNA and cDNA sequences, of the high degree of sequence similarity between this house fly gene and the para gene of D. melanogaster and reinforce the conclusion that Vssc1 is the homolog of para in the house fly.

In D. melanogaster (Thackeray and Ganetzky 1994; O'Dowd et al. 1995) and Drosophila virilis (Thackeray and Ganetzky 1995), multiple sodium channel α subunit variants, each under specific developmental regulation, are generated from the para gene by the alternative usage of 8 exons (designated a-f, h, and i) located in homology domain II and portions of the cytoplasmic linker regions on either side of this domain. Given the heterogeneity of sodium channel-encoding sequences found in these Dipteran species, it was surprising to detect only a single sequence variant among the pool of amplified house fly head cDNA fragments. The Vssc1^(NAIDM) sequence contained segments identical to exon a and homologous (21 identical amino acids out of 24) to exon i of D. melanogaster. Recent studies suggest that both of these exons are required for the expression of high sodium current densities in embryonic D. melanogaster neurons (O'Dowd et al. 1995). In the region encoded by either exon c or exon d, the house fly sequence differs from both D. melanogaster sequences but is slightly more similar to exon d (50 identical amino acids out of 55) than to exon c (49 identical amino acids out of 55). The house fly sequence lacked segments homologous to D. melanogaster exons b, e, and f but contained a segment identical to exon h, which is a variable element found in some D. virilis sequences but not detected in D. melanogaster. The house fly Vssc1^(NAIDM) sequence described is thus characterized as structurally homologous to the a⁺b⁻c⁻d⁺e⁻f⁻h⁺i⁺ splice variant of D. melanogaster and D. virilis. The identification of this molecular form as the predominant sodium channel sequence variant in house fly heads was unexpected because it has not been detected among the arrays of splice variants detected in whole embryos or whole adults of either D. melanogaster or D. virilis.

EXAMPLE II Sequencing of the Insecticide Resistant Vssc of House Fly

The PCR amplification/sequencing strategy summarized in FIG. 2 was also employed to determine the sequence of Vssc1 cDNAs from heads of the 538ge house fly strain that carries the kdr trait. The nucleotide sequence of the VSSC of the 538ge house fly is shown in SEQ ID NO:2, and the amino acid sequence is shown in SEQ ID NO:4. The amino acid sequence of 2104 residues (SEQ ID NO:4) encoded by the Vssc1^(538ge) cDNA contained 12 amino acid differences compared to that of the VSSc1^(NAIDM) sequence (SEQ ID NO:3) as follows: a substitution of phenylalanine for leucine at amino acid residue 1014 of SEQ ID NO:3; a substitution of isoleucine for methionine at amino acid residue 1140 of SEQ ID NO:3; a substitution of aspartic acid for glycine at amino acid residue 2023 of SEQ ID NO:3; a deletion of amino acid residues 2031-2034 of SEQ ID NO:3 (glycine-alanine-threonine-alanine); a substitution of threonine for serine at amino acid residue 2042 of SEQ ID NO:3; a substitution of alanine for valine at amino acid residue 2054 of SEQ ID NO:3; and an insertion of three amino acid residues (asparagine-glycine-glycine) after amino acid residue 2055 of SEQ ID NO:3 (between amino acid residues 2055 and 2056 of SEQ ID NO:3). A comparison of the Vssc1^(538ge) (SEQ ID NO:4) and Vssc1^(NAIDM) (SEQ ID NO:3) amino acid sequences to the para sequence of the Canton-S strain of D. melanogaster (SEQ ID NO:19) is shown in FIG. 3. The locations and amino acid sequence context of the differences are shown in FIG. 4. In FIG. 4, S refers to the NAIDM amino acid sequence (SEQ ID NO:3), and R refers to the kdr sequence (SEQ ID NO:4) Dashes indicate that the Kdr sequence has the identical residue at that position as does the NAIDM sequence. The difference labeled 1 shows amino acids 1009-1019 of SEQ ID NO:3, with the amino acid substitution at residue 1014 shown. The difference labeled 2 shows amino acids 1135-1145 of SEQ ID NO:3, with the amino acid substitution at residue 1140 shown. The difference labeled 3 shows amino acids 2018-2028 of SEQ ID NO:3, with the amino acid substitution at residue 2023 shown. The difference labeled 4 shows amino acids 2027-2038 of SEQ ID NO:3, with the deletion of residues 2031-2034 shown. The difference labeled 5 shows amino acids 2037-2047 of SEQ ID NO:3, with the amino acid substitution at residue 2042 shown. The difference labeled 6 shows amino acids 2051-2059 of SEQ ID NO:3, with the amino acid substitution at residue 2054 shown and the insertion of three residues between 2055 and 2056 shown.

Although preferred embodiments have been depicted and described in detail herein, it will be apparent to those skilled in the relevant art that various modifications, additions, substitutions and the like can be made without departing from the spirit of the invention and these are therefore considered to be within the scope of the invention as defined in the claims which follow.

TABLE 1 Names and sequences of oligonucleotide primers used in the PCR amplification of partial Vssc1 cDNAs. Name Sequence A1 5′-CGGTTGGGCTTTCCTGTC-3′ SEQ ID NO:5 A2 5′-GGGAATTCRAADATRTTCCANCCYTC-3′ SEQ ID NO:6 B1 5′-CCCGARGAYATHGAYCYNTAYTA-3′ SEQ ID NO:7 B2 5′-CGTATCGCCTCCTCCTCG-3′ SEQ ID NO:8 C1 5′-GGGTCTAGATHTTYGCNATHTTYGGNATG′3′ SEQ ID NO:9 C2 5′-GGGGAATTCNGGRTCRAAYTGYTGCCA-3′ SEQ ID NO:10 D1 5′-GGGTCTAGARGANCARAARAARTAYTA-3′ SEQ ID NO:11 D2 5′-TCATACTTTGGCCCAATGTC-3′ SEQ ID NO:12 E1 5′-CCCGAATTAGAGAAGGTGCTG-3′ SEQ ID NO:13 E2 5′-ACTATTGCTTGTGGTCGCCAC-3′ SEQ ID NO:14 F1 5′-CATCNTTRGCNGCNTAGACNATGAC-3′ SEQ ID NO:15 F2 5′-GATTGAATGGATCGAGCAGCC-3′ SEQ ID NO:16 G1 5′-CGTTTCTCCTTTCATATCTAG-3′ SEQ ID NO:17 G2 5′-GGAGBGGBGGNCKBGGNCKNGCTCA-3′ SEQ ID NO:18 Designation of oligonucleotide mixtures: B = G + T + C; D = G + A + T; H = A + T + C; K = G + T; N = A + C + G + T; R = A + G; Y = C + T.

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                   #             SEQUENCE LISTING <160> NUMBER OF SEQ ID NOS: 19 <210> SEQ ID NO 1 <211> LENGTH: 6318 <212> TYPE: DNA <213> ORGANISM: Musca domestica <400> SEQUENCE: 1 atgacagaag attccgactc gatatctgag gaagaacgca gtttgttccg tc #ccttcacc     60 cgcgaatcat tgttacaaat cgaacaacgt atcgctgaac atgaaaaaca aa #aggagctg    120 gaaagaaaga gagccgccga aggagagcag atacgatatg atgacgagga cg #aagatgaa    180 ggtccacagc cggatcccac acttgaacag ggtgtgccta tacctgttcg aa #tgcagggc    240 agcttcccgc cggaattggc ctccactcct ctcgaggata tcgatccctt ct #acagtaat    300 gtactgacat ttgtagtaat aagtaaagga aaggatattt ttcgtttttc tg #cctcaaaa    360 gcaatgtggc tgctcgatcc attcaatccg atacgtcgtg tagccattta ta #ttttagtg    420 catcccttgt tttcgttatt cattatcacc actattctaa ctaattgtat tt #taatgata    480 atgccgacaa cgcccacggt cgaatccaca gaggtgatat tcaccggaat ct #acacattt    540 gaatcagctg ttaaagtgat ggcacgaggt ttcattttat gcccgtttac gt #atcttaga    600 gatgcatgga attggctgga cttcgtagta atagctttag cttatgtgac ca #tgggcata    660 gatttaggta atctcgcagc tttgagaaca tttagggtac tgcgagctct ga #aaaccgta    720 gccattgtgc caggtctaaa aaccattgtc ggtgctgtca ttgaatctgt aa #aaaatcta    780 cgcgatgtga taattttgac aatgttttcc ctgtcggtgt tcgcgctgat gg #gcctacaa    840 atctatatgg gtgttctaac acaaaagtgc attaaacgat tccccctgga cg #gcagttgg    900 ggcaatctga ccgatgaaaa ctggtttcta cacaatagca acagttccaa tt #ggtttacg    960 gagaacgatg gcgagtcata tccggtgtgc gggaatgtat ccggtgcggg ac #aatgcggc   1020 gaggattacg tctgcctgca gggcttcggc cccaatccca actacgacta ca #ccagtttc   1080 gattcattcg gttgggcttt cctgtcggcg tttcgtctca tgacccaaga tt #tctgggag   1140 gatctgtatc agcacgtgct gcaagcagct ggaccctggc acatgttgtt ct #ttatagtc   1200 atcatcttcc taggttcatt ctatcttgtg aatttgattt tggccattgt tg #ccatgtct   1260 tatgacgaat tgcaaaagaa ggccgaagaa gaagaggctg ccgaggagga gg #cgatacga   1320 gaagctgaag aagcggcagc agccaaggcg gccaaactgg aggagcgggc ca #atgtagca   1380 gctcaagcgg ctcaggatgc agcggatgcc gctgcggcag ctctgcatcc cg #agatggca   1440 aagagtccca cgtactcttg cattagctat gaactgtttg ttggcggcga ga #agggcaac   1500 gatgacaaca acaaagagaa gatgtccata cgcagcgtcg aagtggaatc gg #agtcggtg   1560 agcgttatac aaagacaacc agcacctacc acagcacccg ctactaaagt cc #gtaaagtt   1620 agcacgactt ccttatcctt acctggttca ccatttaacc tacgccgggg at #cacgtagt   1680 tcacacaagt acacaatacg aaatgggcgt ggacgttttg gtataccagg ta #gcgatcgc   1740 aagccattgg tactgcaaac atatcaggat gcccagcagc atttgcccta tg #ccgatgac   1800 tcgaatgccg taacaccaat gtccgaagag aatggtgcca ttatagtacc ag #cctactat   1860 tgtaatttag gttctagaca ttcttcatat acctcgcatc aatcaagaat ct #cgtataca   1920 tcacatggtg atttattggg tggcatggcg gccatgggtg ccagcacaat ga #ccaaagag   1980 agcaaattgc gcagtcgcaa cacacgcaat caatcaatcg gtgctgcaac ca #atggtggc   2040 agtagtacgg ctggtggtgg ctatcccgat gccaatcaca aggaacaaag gg #attatgaa   2100 atgggtcagg attatacaga cgaagctggc aaaataaaac accacgacaa tc #cttttatc   2160 gagcccgtcc aaactcaaac agtggtagac atgaaagatg ttatggtctt aa #atgatatc   2220 attgaacaag ccgctggtcg gcatagtcgt gctagtgaac gaggtgagga cg #atgacgaa   2280 gatggtccca cattcaagga catcgccctc gaatacatcc taaaaggcat cg #aaatcttt   2340 tgtgtatggg actgttgttg ggtgtggtta aaatttcagg aatgggtgtc ct #ttattgtg   2400 ttcgatccat tcgtggagct cttcattacc ctgtgtattg tggtcaatac ga #tgtttatg   2460 gccatggatc atcacgacat gaatccggaa ttagagaagg tgctgaaaag tg #gtaactat   2520 ttcttcacgg ccacttttgc aattgaagcc agcatgaaac tgatggccat ga #gcccgaag   2580 tactacttcc aggaaggctg gaacattttc gatttcatta ttgtggcctt gt #ctctgctg   2640 gaattgggcc tggagggtgt ccagggcctg tcggtgttga gaagttttcg tt #tgcttcgt   2700 gtattcaaat tggcaaaatc atggcccaca ctcaatttac tcatttcgat ta #tgggccgg   2760 acaatgggtg cattgggtaa tctgacattt gtactttgca ttatcatctt ca #tctttgcc   2820 gtgatgggaa tgcaactttt cggaaagaac tatattgacc acaaggatcg ct #tcaaggac   2880 catgaattac cgcgctggaa cttcaccgac ttcatgcaca gcttcatgat tg #tgttccga   2940 gtgctgtgcg gagagtggat cgagtccatg tgggactgca tgtatgtggg cg #atgtcagc   3000 tgtataccct tcttcttggc cacggtcgtg ataggcaatc ttgtggttct ta #atcttttc   3060 ttagctttgc ttttgtccaa cttcggttca tctagtttat cagccccgac tg #ccgacaat   3120 gataccaata aaatagcaga ggccttcaat cgtattgctc gttttaagaa ct #gggtgaaa   3180 cgtaatattg ccgattgttt taagttaatt cgaaataaat tgacaaatca aa #taagtgac   3240 caaccatcag aacatggcga taatgaactg gagttgggtc atgacgaaat ca #tgggcgat   3300 ggcttgatca aaaagggtat gaagggcgag acccagctgg aggtggccat tg #gcgatggc   3360 atggagttca cgatacatgg cgatatgaaa aacaacaagc cgaagaaatc aa #aattcatg   3420 aacaacacaa cgatgattgg aaactcaata aaccaccaag acaatagact gg #aacatgag   3480 ctaaaccata gaggtttgtc catacaggac gatgacactg ccagcattaa ct #catatggt   3540 agccataaga atcgaccatt caaggacgag agccacaagg gcagcgccga ga #ccatcgag   3600 ggcgaggaga aacgcgacgt cagcaaagag gacctcggcc tcgacgagga ac #tggacgag   3660 gaggccgagg gcgatgaggg ccagctggat ggtgacatta tcattcatgc gc #aaaacgac   3720 gacgagataa tcgacgacta tccggccgac tgtttccccg actcgtacta ca #agaagttt   3780 ccgatcttgg ccggcgacga ggactcgccg ttctggcaag gatggggcaa tt #tacgactg   3840 aaaacttttc aattaattga aaataaatat tttgaaaccg cagttatcac ta #tgatttta   3900 atgagtagct tagctttggc cttagaagat gttcatttac ccgatcgacc tg #tcatgcag   3960 gatatactgt actacatgga caggatattt acggtgatat tctttttgga ga #tgttgatc   4020 aaatggttgg ccctgggctt taaggtttac ttcaccaatg cctggtgttg gc #tggatttc   4080 gtgattgtca tgctatcgct tataaatttg gttgccgttt ggtcgggctt aa #atgatata   4140 gccgtgttta gatcaatgcg cacactgcgc gccctaaggc cattgcgtgc tg #tctctaga   4200 tgggagggta tgaaagttgt cgtgaatgcg ctggttcaag ctataccgtc ca #tcttcaat   4260 gtgctattgg tgtgtctgat attttggctt atttttgcca ttatgggagt ac #agcttttt   4320 gctggaaaat attttaagtg taaagatggt aatgacactg tgctgagcca tg #aaatcata   4380 ccgaatcgta atgcctgcaa aagtgaaaac tacacctggg aaaattcggc aa #tgaacttc   4440 gatcatgtag gtaatgcgta tctctgtcta tttcaagtgg ccacctttaa gg #gctggatc   4500 cagattatga acgatgccat tgattcacga gaggtggaca agcagccgat cc #gagaaacc   4560 aatatctaca tgtatttata tttcgtattc ttcattatat ttggatcatt tt #tcacactc   4620 aatctgttca ttggtgttat cattgataat tttaatgaac aaaagaagaa ag #ctggtgga   4680 tcattagaaa tgttcatgac agaagatcag aaaaagtact ataatgctat ga #aaaagatg   4740 ggctctaaaa aaccattaaa agccattcca agaccgaggt ggcgaccaca ag #caatagta   4800 ttcgaaatag ttacagataa aaaattcgat ataatcatta tgttgttcat tg #gcttaaac   4860 atgtttacca tgaccctcga tcggtacgac gcctccgagg cgtacaacaa tg #tcctcgac   4920 aaactcaatg ggatattcgt agttattttc agtggcgaat gtctattaaa aa #tattcgct   4980 ttacgatatc actatttcaa agagccatgg aatttatttg atgtagtagt tg #tcatttta   5040 tccatcttag gtcttgtact cagcgacatc attgagaagt atttcgtatc gc #cgacactg   5100 ctccgtgtgg tgagagtggc caaagtgggt cgtgtcctgc gtttagtcaa gg #gtgccaag   5160 ggtatccgga cgttgctgtt cgcgttagcc atgtcgttgc ctgccttatt ca #acatttgt   5220 ctgttgctgt tcttggtgat gttcatcttt gctatctttg gcatgtcctt ct #tcatgcat   5280 gtcaaagaga agagcggcat aaatgctgtg tataatttta agacatttgg cc #aaagtatg   5340 atattgctgt ttcagatgtc tacctcagcc ggttgggatg gtgtgttaga tg #ccattatc   5400 aatgaggaag attgcgatcc acccgacaac gacaagggct atccgggcaa tt #gtggttca   5460 gcgactgttg gaattacgtt tctcctttca tatctagtta taagcttttt ga #tagttatt   5520 aatatgtaca ttgctgtcat tctcgagaac tatagccagg ctacggagga tg #tacaggag   5580 ggtctcaccg acgacgatta cgatatgtac tacgagattt ggcaacaatt cg #atccggag   5640 ggcacccagt acatacgcta cgaccagctg tccgagtttc tggacgtgct gg #agccgccg   5700 ctgcagatcc acaagccgaa caagtacaaa atcatatcga tggacatgcc ga #tatgtcgg   5760 ggcgacatga tgtactgtgt ggatatattg gatgccctga ccaaggactt ct #ttgcgcgc   5820 aagggtaatc cgatcgagga gacgggtgaa attggtgaga tagcggcgcg ac #cggacacc   5880 gagggctatg atccggtgtc gtcaacactg tggcgccagc gtgaggagta ct #gcgccaag   5940 ctgatacaga atgcgtggcg gcgttacaag aatggcccac cccaggaggg tg #atgagggc   6000 gaggcggctg gtggcgaaga tggtgctgaa ggcggtgagg gtgaaggagg ca #gcggcggc   6060 ggcggcggtg atgatggtgg ctcagcgaca ggagcaacgg cggcggcggg ag #ccacatca   6120 ccctcagatc cagatgccgg cgaagcagat ggtgccagcg tcggcggccc cc #ttagtccg   6180 ggctgtgtta gtggcggcag taatggccgc caaacggccg tactggtcga aa #gcgatggt   6240 tttgttacaa aaaacggtca taaggttgta atacactcga gatcgccgag ca #taacatcc   6300 aggacggcag atgtctga              #                   #                   #6318 <210> SEQ ID NO 2 <211> LENGTH: 6315 <212> TYPE: DNA <213> ORGANISM: Musca domestica <400> SEQUENCE: 2 atgacagaag attccgactc gatatctgag gaagaacgca gtttgttccg tc #ccttcacc     60 cgcgaatcat tgttacaaat cgaacaacgt atcgctgaac atgaaaaaca aa #aggagctg    120 gaaagaaaga gagccgccga aggagagcag atacgatatg atgacgagga cg #aagatgaa    180 ggtccacagc cggatcccac acttgaacag ggtgtgccta tacctgttcg aa #tgcagggc    240 agcttcccgc cggaattggc ctccactcct ctcgaggata tcgatccctt ct #acagtaat    300 gtactgacat ttgtagtaat aagtaaagga aaggatattt ttcgtttttc tg #cctcaaaa    360 gcaatgtggc tgctcgatcc attcaatccg atacgtcgtg tagccattta ta #ttttagtg    420 catcccttgt tttcgttatt cattatcacc actattctaa ctaattgtat tt #taatgata    480 atgccgacaa cgcccacggt cgaatccaca gaggtgatat tcaccggaat ct #acacattt    540 gaatcagctg ttaaagtgat ggcacgaggt ttcattttat gcccgtttac gt #atcttaga    600 gatgcatgga attggctgga cttcgtagta atagctttag cttatgtgac ca #tgggcata    660 gatttaggta atctcgcagc tttgagaaca tttagggtac tgcgagctct ga #aaaccgta    720 gccattgtgc caggtctaaa aaccattgtc ggtgctgtca ttgaatctgt aa #aaaatcta    780 cgcgatgtga taattttgac aatgttttcc ctgtcggtgt tcgcgctgat gg #gcctacaa    840 atctatatgg gtgttctaac acaaaagtgc attaaacgat tccccctgga cg #gcagttgg    900 ggcaatctga ccgatgaaaa ctggtttcta cacaatagca acagttccaa tt #ggtttacg    960 gagaacgatg gcgagtcata tccggtgtgc gggaatgtat ccggtgcggg ac #aatgcggc   1020 gaagattacg tctgcctgca gggcttcggc cccaatccca actacgacta ca #ccagtttc   1080 gactcattcg gttgggcttt cctgtcggcg tttcgtctca tgacccaaga tt #tctgggag   1140 gatctgtatc agcacgtgct gcaagcagct ggaccctggc acatgttgtt ct #ttatagtc   1200 atcatcttcc taggttcatt ctatcttgtg aatttgattt tggccattgt tg #ccatgtct   1260 tatgacgaat tgcaaaagaa ggccgaagaa gaagaggctg ccgaggagga gg #cgatccga   1320 gaagctgaag aagcggcagc agccaaggcg gccaaactgg aggagcgggc ca #atgtagca   1380 gctcaagcgg ctcaggatgc agcggatgcc gctgcggcag ctctgcatcc cg #agatggca   1440 aagagtccca cgtactcttg cattagctat gaactgtttg ttggcggcga ga #agggcaac   1500 gatgacaaca acaaggagaa gatgtcgata cgcagcgtcg aagtggaatc gg #agtcggtg   1560 agcgttatac aaagacaacc agcacctacc acagcacccg ctactaaagt cc #gtaaagtt   1620 agcacgactt ccttatcctt acctggttca ccatttaacc tacgccgggg at #cacgtagt   1680 tcacacaagt acacaatacg aaatgggcgt ggacgttttg gtataccagg ta #gcgatcgc   1740 aagccattgg tactgcaaac atatcaggat gcccagcagc atttgcccta tg #ccgatgac   1800 tcgaatgccg taacaccaat gtccgaagag aatggtgcca ttatagtacc ag #cctactat   1860 tgtaatttag gttctagaca ttcttcatat acctcgcatc aatcaagaat ct #cgtataca   1920 tcacatggtg atttattggg tggcatggcg gccatgggtg ccagcacaat ga #ccaaagag   1980 agcaaattgc gcagtcgcaa cacacgcaat caatcaatcg gtgctgcaac ca #atggtggc   2040 agtagtacgg ccggtggtgg ctatcccgat gccaatcaca aggaacaaag gg #attatgaa   2100 atgggtcagg attatacaga cgaagctggc aaaataaaac accacgacaa tc #cttttatc   2160 gagcccgtcc aaactcaaac agtggtagac atgaaagatg ttatggtctt aa #atgatatc   2220 attgaacaag ccgctggtcg gcatagtcgt gctagtgaac gaggtgagga cg #atgacgaa   2280 gatggtccca cattcaagga catcgccctc gaatatatcc taaaaggcat cg #aaatcttt   2340 tgtgtatggg actgttgttg ggtgtggtta aaatttcagg aatgggtctc ct #ttattgtg   2400 ttcgatccat tcgtggagct cttcattacc ctgtgtattg tggtcaatac aa #tgttcatg   2460 gccatggatc atcacgacat gaatccggaa ttggagaagg tgctgaaaag tg #gtaactat   2520 ttcttcacgg ccacttttgc aattgaggcc agcatgaaac tgatggccat ga #gcccgaag   2580 tactacttcc aggaaggctg gaacattttc gatttcatta ttgtggcctt gt #ctctgctg   2640 gaattgggcc tggagggtgt ccagggcctg tcggtgttga gaagttttcg tt #tgcttcgt   2700 gtattcaaat tggcaaaatc atggcccaca ctgaatttac tcatttcgat ta #tgggccgg   2760 acaatgggtg cattgggtaa tctgacattt gtactttgca ttatcatctt ca #tctttgcc   2820 gtgatgggaa tgcaactttt cggaaagaac tatattgacc acaaggatcg ct #tcaaggac   2880 catgaattac cgcgctggaa tttcaccgac ttcatgcaca gcttcatgat tg #tgttccga   2940 gtgctgtgcg gagagtggat cgagtccatg tgggactgca tgtatgtggg cg #atgtcagc   3000 tgtataccct tcttcttggc cacggtcgtg atcggcaatt ttgtggttct ta #atcttttc   3060 ttagctttgc ttttgtccaa cttcggttca tctagtttat cagccccgac tg #ccgacaat   3120 gataccaata aaatagcaga ggccttcaat cgtattgctc gttttaagaa ct #gggtgaaa   3180 cgtaatattg ccgattgttt taagttaatt cgaaataaat tgacaaatca aa #taagtgac   3240 caaccatcag aacatggcga taatgaactg gagttgggtc atgacgaaat ca #tgggcgat   3300 ggcttgatca aaaagggtat gaagggcgag acccagctgg aggtggccat tg #gcgatggc   3360 atggagttca cgatacatgg cgatatgaaa aacaacaagc ccaagaaatc aa #aattcata   3420 aacaacacaa cgatgattgg aaactcaata aaccaccaag acaatagact gg #aacatgag   3480 ctaaaccata gaggtttgtc catacaggac gatgacactg ccagcattaa ct #catatggt   3540 agccataaga atcgaccatt caaggacgag agccacaagg gcagcgccga ga #ccatcgag   3600 ggcgaggaga aacgcgacgt cagcaaagag gacctcggcc tcgacgagga ac #tggacgag   3660 gaggccgagg gcgatgaggg ccagctggat ggtgacatca tcattcatgc cc #aaaacgac   3720 gacgagataa tcgacgacta tccggccgac tgtttccccg actcgtacta ca #agaagttt   3780 ccgatcttgg ccggcgacga ggactcgccg ttctggcaag gatggggcaa tt #tacgactg   3840 aaaacttttc aattaattga aaataaatat tttgaaaccg cagttatcac ta #tgatttta   3900 atgagtagct tagctttggc cttagaagat gttcatttac ccgatcgacc tg #tcatgcag   3960 gatatactgt actacatgga caggatattt acggtgatat tctttttgga ga #tgttgatc   4020 aaatggttgg ccctgggctt taaggtctac ttcaccaatg cctggtgttg gc #tggatttc   4080 gtgattgtca tgctatcgct tataaatttg gttgccgttt ggtcgggctt aa #atgatata   4140 gccgtgttta gatcaatgcg cacactgcgc gccctaaggc cattgcgtgc tg #tctctaga   4200 tgggagggta tgaaagttgt cgtgaatgcg ctggttcaag ctataccgtc ca #tcttcaat   4260 gtgctattgg tgtgtctgat attttggctt atttttgcca ttatgggagt ac #agcttttt   4320 gctggaaaat attttaagtg taaagatggt aatgacactg tgctgagcca tg #aaatcata   4380 ccgaatcgta atgcctgcaa aagtgaaaac tacacctggg aaaattcggc aa #tgaacttc   4440 gatcatgtag gtaatgcgta tctctgtcta tttcaagtgg ccacctttaa gg #gctggatc   4500 cagattatga acgatgccat tgattcacga gaggtggaca agcagccgat cc #gagaaacc   4560 aatatctaca tgtatttata tttcgtattc ttcattatat ttggatcatt tt #tcacactc   4620 aatctgttca ttggtgttat cattgataat tttaatgaac aaaagaagaa ag #caggtgga   4680 tcattagaaa tgttcatgac agaagatcag aaaaagtact ataatgctat ga #aaaagatg   4740 ggctctaaaa aaccattaaa agccattcca agaccgaggt ggcgaccaca ag #caatagta   4800 ttcgaaatag ttacagataa aaaattcgat ataatcatta tgttgttcat tg #gcttaaac   4860 atgtttacca tgaccctcga tcggtacgac gcctccgagg cgtacaacaa tg #tcctcgac   4920 aaactcaatg ggatattcgt agttattttc agtggcgaat gtctattaaa aa #tattcgct   4980 ttacgatatc actatttcaa agagccatgg aatttatttg atgtagtagt tg #tcatttta   5040 tccatcttag gtcttgtact cagcgacatc attgagaagt atttcgtatc gc #cgacactg   5100 ctccgtgtgg tgagagtggc caaagtgggt cgtgtcctgc gtttagtcaa gg #gtgccaag   5160 ggtatccgga cgttgctgtt cgcgttagcc atgtcgttgc ctgccttatt ca #acatttgt   5220 ctgttgctgt tcttggtgat gttcatcttt gctatctttg gcatgtcctt ct #tcatgcat   5280 gtcaaagaga agagcggcat aaatgctgtg tataatttta agacatttgg cc #aaagtatg   5340 atattgctgt ttcagatgtc tacctcagcc ggttgggatg gtgtgttaga tg #ccattatc   5400 aatgaggaag attgcgatcc acccgacaac gacaagggct atccgggcaa tt #gtggttca   5460 gcgactgttg gaattacgtt tctcctttca tatctagtta taagcttttt ga #tagttatt   5520 aatatgtaca ttgctgtcat tctcgagaac tatagccagg ctacggagga tg #tacaggag   5580 ggtctcaccg acgacgacta tgatatgtac tacgagattt ggcaacaatt cg #atccggag   5640 ggtacccagt acataagata cgaccagctg tccgagttcc tggacgtgct gg #agccgccg   5700 ctgcagatcc acaagccgaa caagtacaaa atcatatcga tggacatgcc ga #tatgtcgg   5760 ggcgacatga tgtactgtgt ggatatattg gatgccctga ccaaggactt ct #ttgcgcgc   5820 aagggtaatc cgatcgagga gacgggtgaa attggtgaga ttgcggcgcg ac #cggacacc   5880 gagggctatg atccggtgtc gtcgacactg tggcgccagc gtgaggagta ct #gcgccaag   5940 ctgatacaga atgcgtggcg gcgttacaag aatggcccac cccaggaggg tg #atgagggc   6000 gaggcggctg gtggcgaaga tggtgctgaa ggcggtgagg gtgaaggcgg ca #gcggcggc   6060 ggcggcgatg atgatggtgg ctcagcgacg gcggcgggag ccacatcacc ca #cagatcca   6120 gatgccggcg aagcagatgg tgccagcgcc ggcaatggtg gcggccccct ta #gtccgggc   6180 tgtgttagtg gcggcagtaa tggccgccaa acggccgtac tggtcgaaag cg #atggtttt   6240 gttacaaaaa acggtcataa ggttgtaata cactcgagat cgccgagcat aa #catccagg   6300 acggcagatg tctga               #                   #                   #  6315 <210> SEQ ID NO 3 <211> LENGTH: 2105 <212> TYPE: PRT <213> ORGANISM: Musca domestica <400> SEQUENCE: 3 Met Thr Glu Asp Ser Asp Ser Ile Ser Glu Gl #u Glu Arg Ser Leu Phe   1               5  #                 10  #                 15 Arg Pro Phe Thr Arg Glu Ser Leu Leu Gln Il #e Glu Gln Arg Ile Ala              20      #             25      #             30 Glu His Glu Lys Gln Lys Glu Leu Glu Arg Ly #s Arg Ala Ala Glu Gly          35          #         40          #         45 Glu Gln Ile Arg Tyr Asp Asp Glu Asp Glu As #p Glu Gly Pro Gln Pro      50              #     55              #     60 Asp Pro Thr Leu Glu Gln Gly Val Pro Ile Pr #o Val Arg Met Gln Gly  65                  # 70                  # 75                  # 80 Ser Phe Pro Pro Glu Leu Ala Ser Thr Pro Le #u Glu Asp Ile Asp Pro                  85  #                 90  #                 95 Phe Tyr Ser Asn Val Leu Thr Phe Val Val Il #e Ser Lys Gly Lys Asp             100       #           105       #           110 Ile Phe Arg Phe Ser Ala Ser Lys Ala Met Tr #p Leu Leu Asp Pro Phe         115           #       120           #       125 Asn Pro Ile Arg Arg Val Ala Ile Tyr Ile Le #u Val His Pro Leu Phe     130               #   135               #   140 Ser Leu Phe Ile Ile Thr Thr Ile Leu Thr As #n Cys Ile Leu Met Ile 145                 1 #50                 1 #55                 1 #60 Met Pro Thr Thr Pro Thr Val Glu Ser Thr Gl #u Val Ile Phe Thr Gly                 165   #               170   #               175 Ile Tyr Thr Phe Glu Ser Ala Val Lys Val Me #t Ala Arg Gly Phe Ile             180       #           185       #           190 Leu Cys Pro Phe Thr Tyr Leu Arg Asp Ala Tr #p Asn Trp Leu Asp Phe         195           #       200           #       205 Val Val Ile Ala Leu Ala Tyr Val Thr Met Gl #y Ile Asp Leu Gly Asn     210               #   215               #   220 Leu Ala Ala Leu Arg Thr Phe Arg Val Leu Ar #g Ala Leu Lys Thr Val 225                 2 #30                 2 #35                 2 #40 Ala Ile Val Pro Gly Leu Lys Thr Ile Val Gl #y Ala Val Ile Glu Ser                 245   #               250   #               255 Val Lys Asn Leu Arg Asp Val Ile Ile Leu Th #r Met Phe Ser Leu Ser             260       #           265       #           270 Val Phe Ala Leu Met Gly Leu Gln Ile Tyr Me #t Gly Val Leu Thr Gln         275           #       280           #       285 Lys Cys Ile Lys Arg Phe Pro Leu Asp Gly Se #r Trp Gly Asn Leu Thr     290               #   295               #   300 Asp Glu Asn Trp Phe Leu His Asn Ser Asn Se #r Ser Asn Trp Phe Thr 305                 3 #10                 3 #15                 3 #20 Glu Asn Asp Gly Glu Ser Tyr Pro Val Cys Gl #y Asn Val Ser Gly Ala                 325   #               330   #               335 Gly Gln Cys Gly Glu Asp Tyr Val Cys Leu Gl #n Gly Phe Gly Pro Asn             340       #           345       #           350 Pro Asn Tyr Asp Tyr Thr Ser Phe Asp Ser Ph #e Gly Trp Ala Phe Leu         355           #       360           #       365 Ser Ala Phe Arg Leu Met Thr Gln Asp Phe Tr #p Glu Asp Leu Tyr Gln     370               #   375               #   380 His Val Leu Gln Ala Ala Gly Pro Trp His Me #t Leu Phe Phe Ile Val 385                 3 #90                 3 #95                 4 #00 Ile Ile Phe Leu Gly Ser Phe Tyr Leu Val As #n Leu Ile Leu Ala Ile                 405   #               410   #               415 Val Ala Met Ser Tyr Asp Glu Leu Gln Lys Ly #s Ala Glu Glu Glu Glu             420       #           425       #           430 Ala Ala Glu Glu Glu Ala Ile Arg Glu Ala Gl #u Glu Ala Ala Ala Ala         435           #       440           #       445 Lys Ala Ala Lys Leu Glu Glu Arg Ala Asn Va #l Ala Ala Gln Ala Ala     450               #   455               #   460 Gln Asp Ala Ala Asp Ala Ala Ala Ala Ala Le #u His Pro Glu Met Ala 465                 4 #70                 4 #75                 4 #80 Lys Ser Pro Thr Tyr Ser Cys Ile Ser Tyr Gl #u Leu Phe Val Gly Gly                 485   #               490   #               495 Glu Lys Gly Asn Asp Asp Asn Asn Lys Glu Ly #s Met Ser Ile Arg Ser             500       #           505       #           510 Val Glu Val Glu Ser Glu Ser Val Ser Val Il #e Gln Arg Gln Pro Ala         515           #       520           #       525 Pro Thr Thr Ala Pro Ala Thr Lys Val Arg Ly #s Val Ser Thr Thr Ser     530               #   535               #   540 Leu Ser Leu Pro Gly Ser Pro Phe Asn Leu Ar #g Arg Gly Ser Arg Ser 545                 5 #50                 5 #55                 5 #60 Ser His Lys Tyr Thr Ile Arg Asn Gly Arg Gl #y Arg Phe Gly Ile Pro                 565   #               570   #               575 Gly Ser Asp Arg Lys Pro Leu Val Leu Gln Th #r Tyr Gln Asp Ala Gln             580       #           585       #           590 Gln His Leu Pro Tyr Ala Asp Asp Ser Asn Al #a Val Thr Pro Met Ser         595           #       600           #       605 Glu Glu Asn Gly Ala Ile Ile Val Pro Ala Ty #r Tyr Cys Asn Leu Gly     610               #   615               #   620 Ser Arg His Ser Ser Tyr Thr Ser His Gln Se #r Arg Ile Ser Tyr Thr 625                 6 #30                 6 #35                 6 #40 Ser His Gly Asp Leu Leu Gly Gly Met Ala Al #a Met Gly Ala Ser Thr                 645   #               650   #               655 Met Thr Lys Glu Ser Lys Leu Arg Ser Arg As #n Thr Arg Asn Gln Ser             660       #           665       #           670 Ile Gly Ala Ala Thr Asn Gly Gly Ser Ser Th #r Ala Gly Gly Gly Tyr         675           #       680           #       685 Pro Asp Ala Asn His Lys Glu Gln Arg Asp Ty #r Glu Met Gly Gln Asp     690               #   695               #   700 Tyr Thr Asp Glu Ala Gly Lys Ile Lys His Hi #s Asp Asn Pro Phe Ile 705                 7 #10                 7 #15                 7 #20 Glu Pro Val Gln Thr Gln Thr Val Val Asp Me #t Lys Asp Val Met Val                 725   #               730   #               735 Leu Asn Asp Ile Ile Glu Gln Ala Ala Gly Ar #g His Ser Arg Ala Ser             740       #           745       #           750 Glu Arg Gly Glu Asp Asp Asp Glu Asp Gly Pr #o Thr Phe Lys Asp Ile         755           #       760           #       765 Ala Leu Glu Tyr Ile Leu Lys Gly Ile Glu Il #e Phe Cys Val Trp Asp     770               #   775               #   780 Cys Cys Trp Val Trp Leu Lys Phe Gln Glu Tr #p Val Ser Phe Ile Val 785                 7 #90                 7 #95                 8 #00 Phe Asp Pro Phe Val Glu Leu Phe Ile Thr Le #u Cys Ile Val Val Asn                 805   #               810   #               815 Thr Met Phe Met Ala Met Asp His His Asp Me #t Asn Pro Glu Leu Glu             820       #           825       #           830 Lys Val Leu Lys Ser Gly Asn Tyr Phe Phe Th #r Ala Thr Phe Ala Ile         835           #       840           #       845 Glu Ala Ser Met Lys Leu Met Ala Met Ser Pr #o Lys Tyr Tyr Phe Gln     850               #   855               #   860 Glu Gly Trp Asn Ile Phe Asp Phe Ile Ile Va #l Ala Leu Ser Leu Leu 865                 8 #70                 8 #75                 8 #80 Glu Leu Gly Leu Glu Gly Val Gln Gly Leu Se #r Val Leu Arg Ser Phe                 885   #               890   #               895 Arg Leu Leu Arg Val Phe Lys Leu Ala Lys Se #r Trp Pro Thr Leu Asn             900       #           905       #           910 Leu Leu Ile Ser Ile Met Gly Arg Thr Met Gl #y Ala Leu Gly Asn Leu         915           #       920           #       925 Thr Phe Val Leu Cys Ile Ile Ile Phe Ile Ph #e Ala Val Met Gly Met     930               #   935               #   940 Gln Leu Phe Gly Lys Asn Tyr Ile Asp His Ly #s Asp Arg Phe Lys Asp 945                 9 #50                 9 #55                 9 #60 His Glu Leu Pro Arg Trp Asn Phe Thr Asp Ph #e Met His Ser Phe Met                 965   #               970   #               975 Ile Val Phe Arg Val Leu Cys Gly Glu Trp Il #e Glu Ser Met Trp Asp             980       #           985       #           990 Cys Met Tyr Val Gly Asp Val Ser Cys Ile Pr #o Phe Phe Leu Ala Thr         995           #       1000           #      1005 Val Val Ile Gly Asn Leu Val Val Leu Asn Le #u Phe Leu Ala Leu Leu     1010              #   1015               #  1020 Leu Ser Asn Phe Gly Ser Ser Ser Leu Ser Al #a Pro Thr Ala Asp Asn 1025                1030 #                1035  #               1040 Asp Thr Asn Lys Ile Ala Glu Ala Phe Asn Ar #g Ile Ala Arg Phe Lys                 1045  #               1050   #              1055 Asn Trp Val Lys Arg Asn Ile Ala Asp Cys Ph #e Lys Leu Ile Arg Asn             1060      #           1065       #          1070 Lys Leu Thr Asn Gln Ile Ser Asp Gln Pro Se #r Glu His Gly Asp Asn         1075          #       1080           #      1085 Glu Leu Glu Leu Gly His Asp Glu Ile Met Gl #y Asp Gly Leu Ile Lys     1090              #   1095               #  1100 Lys Gly Met Lys Gly Glu Thr Gln Leu Glu Va #l Ala Ile Gly Asp Gly 1105                1110 #                1115  #               1120 Met Glu Phe Thr Ile His Gly Asp Met Lys As #n Asn Lys Pro Lys Lys                 1125  #               1130   #              1135 Ser Lys Phe Met Asn Asn Thr Thr Met Ile Gl #y Asn Ser Ile Asn His             1140      #           1145       #          1150 Gln Asp Asn Arg Leu Glu His Glu Leu Asn Hi #s Arg Gly Leu Ser Ile         1155          #       1160           #      1165 Gln Asp Asp Asp Thr Ala Ser Ile Asn Ser Ty #r Gly Ser His Lys Asn     1170              #   1175               #  1180 Arg Pro Phe Lys Asp Glu Ser His Lys Gly Se #r Ala Glu Thr Ile Glu 1185                1190 #                1195  #               1200 Gly Glu Glu Lys Arg Asp Val Ser Lys Glu As #p Leu Gly Leu Asp Glu                 1205  #               1210   #              1215 Glu Leu Asp Glu Glu Ala Glu Gly Asp Glu Gl #y Gln Leu Asp Gly Asp             1220      #           1225       #          1230 Ile Ile Ile His Ala Gln Asn Asp Asp Glu Il #e Ile Asp Asp Tyr Pro         1235          #       1240           #      1245 Ala Asp Cys Phe Pro Asp Ser Tyr Tyr Lys Ly #s Phe Pro Ile Leu Ala     1250              #   1255               #  1260 Gly Asp Glu Asp Ser Pro Phe Trp Gln Gly Tr #p Gly Asn Leu Arg Leu 1265                1270 #                1275  #               1280 Lys Thr Phe Gln Leu Ile Glu Asn Lys Tyr Ph #e Glu Thr Ala Val Ile                 1285  #               1290   #              1295 Thr Met Ile Leu Met Ser Ser Leu Ala Leu Al #a Leu Glu Asp Val His             1300      #           1305       #          1310 Leu Pro Asp Arg Pro Val Met Gln Asp Ile Le #u Tyr Tyr Met Asp Arg         1315          #       1320           #      1325 Ile Phe Thr Val Ile Phe Phe Leu Glu Met Le #u Ile Lys Trp Leu Ala     1330              #   1335               #  1340 Leu Gly Phe Lys Val Tyr Phe Thr Asn Ala Tr #p Cys Trp Leu Asp Phe 1345                1350 #                1355  #               1360 Val Ile Val Met Leu Ser Leu Ile Asn Leu Va #l Ala Val Trp Ser Gly                 1365  #               1370   #              1375 Leu Asn Asp Ile Ala Val Phe Arg Ser Met Ar #g Thr Leu Arg Ala Leu             1380      #           1385       #          1390 Arg Pro Leu Arg Ala Val Ser Arg Trp Glu Gl #y Met Lys Val Val Val         1395          #       1400           #      1405 Asn Ala Leu Val Gln Ala Ile Pro Ser Ile Ph #e Asn Val Leu Leu Val     1410              #   1415               #  1420 Cys Leu Ile Phe Trp Leu Ile Phe Ala Ile Me #t Gly Val Gln Leu Phe 1425                1430 #                1435  #               1440 Ala Gly Lys Tyr Phe Lys Cys Lys Asp Gly As #n Asp Thr Val Leu Ser                 1445  #               1450   #              1455 His Glu Ile Ile Pro Asn Arg Asn Ala Cys Ly #s Ser Glu Asn Tyr Thr             1460      #           1465       #          1470 Trp Glu Asn Ser Ala Met Asn Phe Asp His Va #l Gly Asn Ala Tyr Leu         1475          #       1480           #      1485 Cys Leu Phe Gln Val Ala Thr Phe Lys Gly Tr #p Ile Gln Ile Met Asn     1490              #   1495               #  1500 Asp Ala Ile Asp Ser Arg Glu Val Asp Lys Gl #n Pro Ile Arg Glu Thr 1505                1510 #                1515  #               1520 Asn Ile Tyr Met Tyr Leu Tyr Phe Val Phe Ph #e Ile Ile Phe Gly Ser                 1525  #               1530   #              1535 Phe Phe Thr Leu Asn Leu Phe Ile Gly Val Il #e Ile Asp Asn Phe Asn             1540      #           1545       #          1550 Glu Gln Lys Lys Lys Ala Gly Gly Ser Leu Gl #u Met Phe Met Thr Glu         1555          #       1560           #      1565 Asp Gln Lys Lys Tyr Tyr Asn Ala Met Lys Ly #s Met Gly Ser Lys Lys     1570              #   1575               #  1580 Pro Leu Lys Ala Ile Pro Arg Pro Arg Trp Ar #g Pro Gln Ala Ile Val 1585                1590 #                1595  #               1600 Phe Glu Ile Val Thr Asp Lys Lys Phe Asp Il #e Ile Ile Met Leu Phe                 1605  #               1610   #              1615 Ile Gly Leu Asn Met Phe Thr Met Thr Leu As #p Arg Tyr Asp Ala Ser             1620      #           1625       #          1630 Glu Ala Tyr Asn Asn Val Leu Asp Lys Leu As #n Gly Ile Phe Val Val         1635          #       1640           #      1645 Ile Phe Ser Gly Glu Cys Leu Leu Lys Ile Ph #e Ala Leu Arg Tyr His     1650              #   1655               #  1660 Tyr Phe Lys Glu Pro Trp Asn Leu Phe Asp Va #l Val Val Val Ile Leu 1665                1670 #                1675  #               1680 Ser Ile Leu Gly Leu Val Leu Ser Asp Ile Il #e Glu Lys Tyr Phe Val                 1685  #               1690   #              1695 Ser Pro Thr Leu Leu Arg Val Val Arg Val Al #a Lys Val Gly Arg Val             1700      #           1705       #          1710 Leu Arg Leu Val Lys Gly Ala Lys Gly Ile Ar #g Thr Leu Leu Phe Ala         1715          #       1720           #      1725 Leu Ala Met Ser Leu Pro Ala Leu Phe Asn Il #e Cys Leu Leu Leu Phe     1730              #   1735               #  1740 Leu Val Met Phe Ile Phe Ala Ile Phe Gly Me #t Ser Phe Phe Met His 1745                1750 #                1755  #               1760 Val Lys Glu Lys Ser Gly Ile Asn Ala Val Ty #r Asn Phe Lys Thr Phe                 1765  #               1770   #              1775 Gly Gln Ser Met Ile Leu Leu Phe Gln Met Se #r Thr Ser Ala Gly Trp             1780      #           1785       #          1790 Asp Gly Val Leu Asp Ala Ile Ile Asn Glu Gl #u Asp Cys Asp Pro Pro         1795          #       1800           #      1805 Asp Asn Asp Lys Gly Tyr Pro Gly Asn Cys Gl #y Ser Ala Thr Val Gly     1810              #   1815               #  1820 Ile Thr Phe Leu Leu Ser Tyr Leu Val Ile Se #r Phe Leu Ile Val Ile 1825                1830 #                1835  #               1840 Asn Met Tyr Ile Ala Val Ile Leu Glu Asn Ty #r Ser Gln Ala Thr Glu                 1845  #               1850   #              1855 Asp Val Gln Glu Gly Leu Thr Asp Asp Asp Ty #r Asp Met Tyr Tyr Glu             1860      #           1865       #          1870 Ile Trp Gln Gln Phe Asp Pro Glu Gly Thr Gl #n Tyr Ile Arg Tyr Asp         1875          #       1880           #      1885 Gln Leu Ser Glu Phe Leu Asp Val Leu Glu Pr #o Pro Leu Gln Ile His     1890              #   1895               #  1900 Lys Pro Asn Lys Tyr Lys Ile Ile Ser Met As #p Met Pro Ile Cys Arg 1905                1910 #                1915  #               1920 Gly Asp Met Met Tyr Cys Val Asp Ile Leu As #p Ala Leu Thr Lys Asp                 1925  #               1930   #              1935 Phe Phe Ala Arg Lys Gly Asn Pro Ile Glu Gl #u Thr Gly Glu Ile Gly             1940      #           1945       #          1950 Glu Ile Ala Ala Arg Pro Asp Thr Glu Gly Ty #r Asp Pro Val Ser Ser         1955          #       1960           #      1965 Thr Leu Trp Arg Gln Arg Glu Glu Tyr Cys Al #a Lys Leu Ile Gln Asn     1970              #   1975               #  1980 Ala Trp Arg Arg Tyr Lys Asn Gly Pro Pro Gl #n Glu Gly Asp Glu Gly 1985                1990 #                1995  #               2000 Glu Ala Ala Gly Gly Glu Asp Gly Ala Glu Gl #y Gly Glu Gly Glu Gly                 2005  #               2010   #              2015 Gly Ser Gly Gly Gly Gly Gly Asp Asp Gly Gl #y Ser Ala Thr Gly Ala             2020      #           2025       #          2030 Thr Ala Ala Ala Gly Ala Thr Ser Pro Ser As #p Pro Asp Ala Gly Glu         2035          #       2040           #      2045 Ala Asp Gly Ala Ser Val Gly Gly Pro Leu Se #r Pro Gly Cys Val Ser     2050              #   2055               #  2060 Gly Gly Ser Asn Gly Arg Gln Thr Ala Val Le #u Val Glu Ser Asp Gly 2065                2070 #                2075  #               2080 Phe Val Thr Lys Asn Gly His Lys Val Val Il #e His Ser Arg Ser Pro                 2085  #               2090   #              2095 Ser Ile Thr Ser Arg Thr Ala Asp Val             2100      #           2105 <210> SEQ ID NO 4 <211> LENGTH: 2104 <212> TYPE: PRT <213> ORGANISM: Musca domestica <400> SEQUENCE: 4 Met Thr Glu Asp Ser Asp Ser Ile Ser Glu Gl #u Glu Arg Ser Leu Phe   1               5  #                 10  #                 15 Arg Pro Phe Thr Arg Glu Ser Leu Leu Gln Il #e Glu Gln Arg Ile Ala              20      #             25      #             30 Glu His Glu Lys Gln Lys Glu Leu Glu Arg Ly #s Arg Ala Ala Glu Gly          35          #         40          #         45 Glu Gln Ile Arg Tyr Asp Asp Glu Asp Glu As #p Glu Gly Pro Gln Pro      50              #     55              #     60 Asp Pro Thr Leu Glu Gln Gly Val Pro Ile Pr #o Val Arg Met Gln Gly  65                  # 70                  # 75                  # 80 Ser Phe Pro Pro Glu Leu Ala Ser Thr Pro Le #u Glu Asp Ile Asp Pro                  85  #                 90  #                 95 Phe Tyr Ser Asn Val Leu Thr Phe Val Val Il #e Ser Lys Gly Lys Asp             100       #           105       #           110 Ile Phe Arg Phe Ser Ala Ser Lys Ala Met Tr #p Leu Leu Asp Pro Phe         115           #       120           #       125 Asn Pro Ile Arg Arg Val Ala Ile Tyr Ile Le #u Val His Pro Leu Phe     130               #   135               #   140 Ser Leu Phe Ile Ile Thr Thr Ile Leu Thr As #n Cys Ile Leu Met Ile 145                 1 #50                 1 #55                 1 #60 Met Pro Thr Thr Pro Thr Val Glu Ser Thr Gl #u Val Ile Phe Thr Gly                 165   #               170   #               175 Ile Tyr Thr Phe Glu Ser Ala Val Lys Val Me #t Ala Arg Gly Phe Ile             180       #           185       #           190 Leu Cys Pro Phe Thr Tyr Leu Arg Asp Ala Tr #p Asn Trp Leu Asp Phe         195           #       200           #       205 Val Val Ile Ala Leu Ala Tyr Val Thr Met Gl #y Ile Asp Leu Gly Asn     210               #   215               #   220 Leu Ala Ala Leu Arg Thr Phe Arg Val Leu Ar #g Ala Leu Lys Thr Val 225                 2 #30                 2 #35                 2 #40 Ala Ile Val Pro Gly Leu Lys Thr Ile Val Gl #y Ala Val Ile Glu Ser                 245   #               250   #               255 Val Lys Asn Leu Arg Asp Val Ile Ile Leu Th #r Met Phe Ser Leu Ser             260       #           265       #           270 Val Phe Ala Leu Met Gly Leu Gln Ile Tyr Me #t Gly Val Leu Thr Gln         275           #       280           #       285 Lys Cys Ile Lys Arg Phe Pro Leu Asp Gly Se #r Trp Gly Asn Leu Thr     290               #   295               #   300 Asp Glu Asn Trp Phe Leu His Asn Ser Asn Se #r Ser Asn Trp Phe Thr 305                 3 #10                 3 #15                 3 #20 Glu Asn Asp Gly Glu Ser Tyr Pro Val Cys Gl #y Asn Val Ser Gly Ala                 325   #               330   #               335 Gly Gln Cys Gly Glu Asp Tyr Val Cys Leu Gl #n Gly Phe Gly Pro Asn             340       #           345       #           350 Pro Asn Tyr Asp Tyr Thr Ser Phe Asp Ser Ph #e Gly Trp Ala Phe Leu         355           #       360           #       365 Ser Ala Phe Arg Leu Met Thr Gln Asp Phe Tr #p Glu Asp Leu Tyr Gln     370               #   375               #   380 His Val Leu Gln Ala Ala Gly Pro Trp His Me #t Leu Phe Phe Ile Val 385                 3 #90                 3 #95                 4 #00 Ile Ile Phe Leu Gly Ser Phe Tyr Leu Val As #n Leu Ile Leu Ala Ile                 405   #               410   #               415 Val Ala Met Ser Tyr Asp Glu Leu Gln Lys Ly #s Ala Glu Glu Glu Glu             420       #           425       #           430 Ala Ala Glu Glu Glu Ala Ile Arg Glu Ala Gl #u Glu Ala Ala Ala Ala         435           #       440           #       445 Lys Ala Ala Lys Leu Glu Glu Arg Ala Asn Va #l Ala Ala Gln Ala Ala     450               #   455               #   460 Gln Asp Ala Ala Asp Ala Ala Ala Ala Ala Le #u His Pro Glu Met Ala 465                 4 #70                 4 #75                 4 #80 Lys Ser Pro Thr Tyr Ser Cys Ile Ser Tyr Gl #u Leu Phe Val Gly Gly                 485   #               490   #               495 Glu Lys Gly Asn Asp Asp Asn Asn Lys Glu Ly #s Met Ser Ile Arg Ser             500       #           505       #           510 Val Glu Val Glu Ser Glu Ser Val Ser Val Il #e Gln Arg Gln Pro Ala         515           #       520           #       525 Pro Thr Thr Ala Pro Ala Thr Lys Val Arg Ly #s Val Ser Thr Thr Ser     530               #   535               #   540 Leu Ser Leu Pro Gly Ser Pro Phe Asn Leu Ar #g Arg Gly Ser Arg Ser 545                 5 #50                 5 #55                 5 #60 Ser His Lys Tyr Thr Ile Arg Asn Gly Arg Gl #y Arg Phe Gly Ile Pro                 565   #               570   #               575 Gly Ser Asp Arg Lys Pro Leu Val Leu Gln Th #r Tyr Gln Asp Ala Gln             580       #           585       #           590 Gln His Leu Pro Tyr Ala Asp Asp Ser Asn Al #a Val Thr Pro Met Ser         595           #       600           #       605 Glu Glu Asn Gly Ala Ile Ile Val Pro Ala Ty #r Tyr Cys Asn Leu Gly     610               #   615               #   620 Ser Arg His Ser Ser Tyr Thr Ser His Gln Se #r Arg Ile Ser Tyr Thr 625                 6 #30                 6 #35                 6 #40 Ser His Gly Asp Leu Leu Gly Gly Met Ala Al #a Met Gly Ala Ser Thr                 645   #               650   #               655 Met Thr Lys Glu Ser Lys Leu Arg Ser Arg As #n Thr Arg Asn Gln Ser             660       #           665       #           670 Ile Gly Ala Ala Thr Asn Gly Gly Ser Ser Th #r Ala Gly Gly Gly Tyr         675           #       680           #       685 Pro Asp Ala Asn His Lys Glu Gln Arg Asp Ty #r Glu Met Gly Gln Asp     690               #   695               #   700 Tyr Thr Asp Glu Ala Gly Lys Ile Lys His Hi #s Asp Asn Pro Phe Ile 705                 7 #10                 7 #15                 7 #20 Glu Pro Val Gln Thr Gln Thr Val Val Asp Me #t Lys Asp Val Met Val                 725   #               730   #               735 Leu Asn Asp Ile Ile Glu Gln Ala Ala Gly Ar #g His Ser Arg Ala Ser             740       #           745       #           750 Glu Arg Gly Glu Asp Asp Asp Glu Asp Gly Pr #o Thr Phe Lys Asp Ile         755           #       760           #       765 Ala Leu Glu Tyr Ile Leu Lys Gly Ile Glu Il #e Phe Cys Val Trp Asp     770               #   775               #   780 Cys Cys Trp Val Trp Leu Lys Phe Gln Glu Tr #p Val Ser Phe Ile Val 785                 7 #90                 7 #95                 8 #00 Phe Asp Pro Phe Val Glu Leu Phe Ile Thr Le #u Cys Ile Val Val Asn                 805   #               810   #               815 Thr Met Phe Met Ala Met Asp His His Asp Me #t Asn Pro Glu Leu Glu             820       #           825       #           830 Lys Val Leu Lys Ser Gly Asn Tyr Phe Phe Th #r Ala Thr Phe Ala Ile         835           #       840           #       845 Glu Ala Ser Met Lys Leu Met Ala Met Ser Pr #o Lys Tyr Tyr Phe Gln     850               #   855               #   860 Glu Gly Trp Asn Ile Phe Asp Phe Ile Ile Va #l Ala Leu Ser Leu Leu 865                 8 #70                 8 #75                 8 #80 Glu Leu Gly Leu Glu Gly Val Gln Gly Leu Se #r Val Leu Arg Ser Phe                 885   #               890   #               895 Arg Leu Leu Arg Val Phe Lys Leu Ala Lys Se #r Trp Pro Thr Leu Asn             900       #           905       #           910 Leu Leu Ile Ser Ile Met Gly Arg Thr Met Gl #y Ala Leu Gly Asn Leu         915           #       920           #       925 Thr Phe Val Leu Cys Ile Ile Ile Phe Ile Ph #e Ala Val Met Gly Met     930               #   935               #   940 Gln Leu Phe Gly Lys Asn Tyr Ile Asp His Ly #s Asp Arg Phe Lys Asp 945                 9 #50                 9 #55                 9 #60 His Glu Leu Pro Arg Trp Asn Phe Thr Asp Ph #e Met His Ser Phe Met                 965   #               970   #               975 Ile Val Phe Arg Val Leu Cys Gly Glu Trp Il #e Glu Ser Met Trp Asp             980       #           985       #           990 Cys Met Tyr Val Gly Asp Val Ser Cys Ile Pr #o Phe Phe Leu Ala Thr         995           #       1000           #      1005 Val Val Ile Gly Asn Phe Val Val Leu Asn Le #u Phe Leu Ala Leu Leu     1010              #   1015               #  1020 Leu Ser Asn Phe Gly Ser Ser Ser Leu Ser Al #a Pro Thr Ala Asp Asn 1025                1030 #                1035  #               1040 Asp Thr Asn Lys Ile Ala Glu Ala Phe Asn Ar #g Ile Ala Arg Phe Lys                 1045  #               1050   #              1055 Asn Trp Val Lys Arg Asn Ile Ala Asp Cys Ph #e Lys Leu Ile Arg Asn             1060      #           1065       #          1070 Lys Leu Thr Asn Gln Ile Ser Asp Gln Pro Se #r Glu His Gly Asp Asn         1075          #       1080           #      1085 Glu Leu Glu Leu Gly His Asp Glu Ile Met Gl #y Asp Gly Leu Ile Lys     1090              #   1095               #  1100 Lys Gly Met Lys Gly Glu Thr Gln Leu Glu Va #l Ala Ile Gly Asp Gly 1105                1110 #                1115  #               1120 Met Glu Phe Thr Ile His Gly Asp Met Lys As #n Asn Lys Pro Lys Lys                 1125  #               1130   #              1135 Ser Lys Phe Ile Asn Asn Thr Thr Met Ile Gl #y Asn Ser Ile Asn His             1140      #           1145       #          1150 Gln Asp Asn Arg Leu Glu His Glu Leu Asn Hi #s Arg Gly Leu Ser Ile         1155          #       1160           #      1165 Gln Asp Asp Asp Thr Ala Ser Ile Asn Ser Ty #r Gly Ser His Lys Asn     1170              #   1175               #  1180 Arg Pro Phe Lys Asp Glu Ser His Lys Gly Se #r Ala Glu Thr Ile Glu 1185                1190 #                1195  #               1200 Gly Glu Glu Lys Arg Asp Val Ser Lys Glu As #p Leu Gly Leu Asp Glu                 1205  #               1210   #              1215 Glu Leu Asp Glu Glu Ala Glu Gly Asp Glu Gl #y Gln Leu Asp Gly Asp             1220      #           1225       #          1230 Ile Ile Ile His Ala Gln Asn Asp Asp Glu Il #e Ile Asp Asp Tyr Pro         1235          #       1240           #      1245 Ala Asp Cys Phe Pro Asp Ser Tyr Tyr Lys Ly #s Phe Pro Ile Leu Ala     1250              #   1255               #  1260 Gly Asp Glu Asp Ser Pro Phe Trp Gln Gly Tr #p Gly Asn Leu Arg Leu 1265                1270 #                1275  #               1280 Lys Thr Phe Gln Leu Ile Glu Asn Lys Tyr Ph #e Glu Thr Ala Val Ile                 1285  #               1290   #              1295 Thr Met Ile Leu Met Ser Ser Leu Ala Leu Al #a Leu Glu Asp Val His             1300      #           1305       #          1310 Leu Pro Asp Arg Pro Val Met Gln Asp Ile Le #u Tyr Tyr Met Asp Arg         1315          #       1320           #      1325 Ile Phe Thr Val Ile Phe Phe Leu Glu Met Le #u Ile Lys Trp Leu Ala     1330              #   1335               #  1340 Leu Gly Phe Lys Val Tyr Phe Thr Asn Ala Tr #p Cys Trp Leu Asp Phe 1345                1350 #                1355  #               1360 Val Ile Val Met Leu Ser Leu Ile Asn Leu Va #l Ala Val Trp Ser Gly                 1365  #               1370   #              1375 Leu Asn Asp Ile Ala Val Phe Arg Ser Met Ar #g Thr Leu Arg Ala Leu             1380      #           1385       #          1390 Arg Pro Leu Arg Ala Val Ser Arg Trp Glu Gl #y Met Lys Val Val Val         1395          #       1400           #      1405 Asn Ala Leu Val Gln Ala Ile Pro Ser Ile Ph #e Asn Val Leu Leu Val     1410              #   1415               #  1420 Cys Leu Ile Phe Trp Leu Ile Phe Ala Ile Me #t Gly Val Gln Leu Phe 1425                1430 #                1435  #               1440 Ala Gly Lys Tyr Phe Lys Cys Lys Asp Gly As #n Asp Thr Val Leu Ser                 1445  #               1450   #              1455 His Glu Ile Ile Pro Asn Arg Asn Ala Cys Ly #s Ser Glu Asn Tyr Thr             1460      #           1465       #          1470 Trp Glu Asn Ser Ala Met Asn Phe Asp His Va #l Gly Asn Ala Tyr Leu         1475          #       1480           #      1485 Cys Leu Phe Gln Val Ala Thr Phe Lys Gly Tr #p Ile Gln Ile Met Asn     1490              #   1495               #  1500 Asp Ala Ile Asp Ser Arg Glu Val Asp Lys Gl #n Pro Ile Arg Glu Thr 1505                1510 #                1515  #               1520 Asn Ile Tyr Met Tyr Leu Tyr Phe Val Phe Ph #e Ile Ile Phe Gly Ser                 1525  #               1530   #              1535 Phe Phe Thr Leu Asn Leu Phe Ile Gly Val Il #e Ile Asp Asn Phe Asn             1540      #           1545       #          1550 Glu Gln Lys Lys Lys Ala Gly Gly Ser Leu Gl #u Met Phe Met Thr Glu         1555          #       1560           #      1565 Asp Gln Lys Lys Tyr Tyr Asn Ala Met Lys Ly #s Met Gly Ser Lys Lys     1570              #   1575               #  1580 Pro Leu Lys Ala Ile Pro Arg Pro Arg Trp Ar #g Pro Gln Ala Ile Val 1585                1590 #                1595  #               1600 Phe Glu Ile Val Thr Asp Lys Lys Phe Asp Il #e Ile Ile Met Leu Phe                 1605  #               1610   #              1615 Ile Gly Leu Asn Met Phe Thr Met Thr Leu As #p Arg Tyr Asp Ala Ser             1620      #           1625       #          1630 Glu Ala Tyr Asn Asn Val Leu Asp Lys Leu As #n Gly Ile Phe Val Val         1635          #       1640           #      1645 Ile Phe Ser Gly Glu Cys Leu Leu Lys Ile Ph #e Ala Leu Arg Tyr His     1650              #   1655               #  1660 Tyr Phe Lys Glu Pro Trp Asn Leu Phe Asp Va #l Val Val Val Ile Leu 1665                1670 #                1675  #               1680 Ser Ile Leu Gly Leu Val Leu Ser Asp Ile Il #e Glu Lys Tyr Phe Val                 1685  #               1690   #              1695 Ser Pro Thr Leu Leu Arg Val Val Arg Val Al #a Lys Val Gly Arg Val             1700      #           1705       #          1710 Leu Arg Leu Val Lys Gly Ala Lys Gly Ile Ar #g Thr Leu Leu Phe Ala         1715          #       1720           #      1725 Leu Ala Met Ser Leu Pro Ala Leu Phe Asn Il #e Cys Leu Leu Leu Phe     1730              #   1735               #  1740 Leu Val Met Phe Ile Phe Ala Ile Phe Gly Me #t Ser Phe Phe Met His 1745                1750 #                1755  #               1760 Val Lys Glu Lys Ser Gly Ile Asn Ala Val Ty #r Asn Phe Lys Thr Phe                 1765  #               1770   #              1775 Gly Gln Ser Met Ile Leu Leu Phe Gln Met Se #r Thr Ser Ala Gly Trp             1780      #           1785       #          1790 Asp Gly Val Leu Asp Ala Ile Ile Asn Glu Gl #u Asp Cys Asp Pro Pro         1795          #       1800           #      1805 Asp Asn Asp Lys Gly Tyr Pro Gly Asn Cys Gl #y Ser Ala Thr Val Gly     1810              #   1815               #  1820 Ile Thr Phe Leu Leu Ser Tyr Leu Val Ile Se #r Phe Leu Ile Val Ile 1825                1830 #                1835  #               1840 Asn Met Tyr Ile Ala Val Ile Leu Glu Asn Ty #r Ser Gln Ala Thr Glu                 1845  #               1850   #              1855 Asp Val Gln Glu Gly Leu Thr Asp Asp Asp Ty #r Asp Met Tyr Tyr Glu             1860      #           1865       #          1870 Ile Trp Gln Gln Phe Asp Pro Glu Gly Thr Gl #n Tyr Ile Arg Tyr Asp         1875          #       1880           #      1885 Gln Leu Ser Glu Phe Leu Asp Val Leu Glu Pr #o Pro Leu Gln Ile His     1890              #   1895               #  1900 Lys Pro Asn Lys Tyr Lys Ile Ile Ser Met As #p Met Pro Ile Cys Arg 1905                1910 #                1915  #               1920 Gly Asp Met Met Tyr Cys Val Asp Ile Leu As #p Ala Leu Thr Lys Asp                 1925  #               1930   #              1935 Phe Phe Ala Arg Lys Gly Asn Pro Ile Glu Gl #u Thr Gly Glu Ile Gly             1940      #           1945       #          1950 Glu Ile Ala Ala Arg Pro Asp Thr Glu Gly Ty #r Asp Pro Val Ser Ser         1955          #       1960           #      1965 Thr Leu Trp Arg Gln Arg Glu Glu Tyr Cys Al #a Lys Leu Ile Gln Asn     1970              #   1975               #  1980 Ala Trp Arg Arg Tyr Lys Asn Gly Pro Pro Gl #n Glu Gly Asp Glu Gly 1985                1990 #                1995  #               2000 Glu Ala Ala Gly Gly Glu Asp Gly Ala Glu Gl #y Gly Glu Gly Glu Gly                 2005  #               2010   #              2015 Gly Ser Gly Gly Gly Gly Asp Asp Asp Gly Gl #y Ser Ala Thr Ala Ala             2020      #           2025       #          2030 Gly Ala Thr Ser Pro Thr Asp Pro Asp Ala Gl #y Glu Ala Asp Gly Ala         2035          #       2040           #      2045 Ser Ala Gly Asn Gly Gly Gly Pro Leu Ser Pr #o Gly Cys Val Ser Gly     2050              #   2055               #  2060 Gly Ser Asn Gly Arg Gln Thr Ala Val Leu Va #l Glu Ser Asp Gly Phe 2065                2070 #                2075  #               2080 Val Thr Lys Asn Gly His Lys Val Val Ile Hi #s Ser Arg Ser Pro Ser                 2085  #               2090   #              2095 Ile Thr Ser Arg Thr Ala Asp Val             2100 <210> SEQ ID NO 5 <211> LENGTH: 18 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <400> SEQUENCE: 5 cggttgggct ttcctgtc              #                   #                   #  18 <210> SEQ ID NO 6 <211> LENGTH: 26 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <220> FEATURE: <221> NAME/KEY: unsure <222> LOCATION: (21) <223> OTHER INFORMATION: N at position 21 is  #either A, C, G, or T <400> SEQUENCE: 6 gggaattcra adatrttcca nccytc           #                   #              26 <210> SEQ ID NO 7 <211> LENGTH: 23 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <220> FEATURE: <221> NAME/KEY: unsure <222> LOCATION: (18) <223> OTHER INFORMATION: N at position 18 is  #either A, C, G, or T <400> SEQUENCE: 7 cccgargaya thgaycynta yta            #                   #                23 <210> SEQ ID NO 8 <211> LENGTH: 18 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <400> SEQUENCE: 8 cgtatcgcct cctcctcg              #                   #                   #  18 <210> SEQ ID NO 9 <211> LENGTH: 29 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <220> FEATURE: <221> NAME/KEY: unsure <222> LOCATION: (17) <223> OTHER INFORMATION: N at any position in  #this sequence is A, C, G,       or T <400> SEQUENCE: 9 gggtctagat httygcnath ttyggnatg          #                   #            29 <210> SEQ ID NO 10 <211> LENGTH: 27 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <220> FEATURE: <221> NAME/KEY: unsure <222> LOCATION: (10) <223> OTHER INFORMATION: N at position 10 is  #either A, C, G, or T <400> SEQUENCE: 10 ggggaattcn ggrtcraayt gytgcca           #                   #             27 <210> SEQ ID NO 11 <211> LENGTH: 27 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <220> FEATURE: <221> NAME/KEY: unsure <222> LOCATION: (13) <223> OTHER INFORMATION: N at position 13 is  #either A, C, G, or T <400> SEQUENCE: 11 gggtctagar gancaraara artayta           #                   #             27 <210> SEQ ID NO 12 <211> LENGTH: 20 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <400> SEQUENCE: 12 tcatactttg gcccaatgtc             #                   #                   # 20 <210> SEQ ID NO 13 <211> LENGTH: 21 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <400> SEQUENCE: 13 cccgaattag agaaggtgct g            #                   #                   #21 <210> SEQ ID NO 14 <211> LENGTH: 21 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <400> SEQUENCE: 14 actattgctt gtggtcgcca c            #                   #                   #21 <210> SEQ ID NO 15 <211> LENGTH: 25 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <220> FEATURE: <221> NAME/KEY: unsure <222> LOCATION: (5) <223> OTHER INFORMATION: N at any position in  #this sequence is A, C, G,       or T <400> SEQUENCE: 15 catcnttrgc ngcntagacn atgac           #                   #               25 <210> SEQ ID NO 16 <211> LENGTH: 21 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <400> SEQUENCE: 16 gattgaatgg atcgagcagc c            #                   #                   #21 <210> SEQ ID NO 17 <211> LENGTH: 21 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <400> SEQUENCE: 17 cgtttctcct ttcatatcta g            #                   #                   #21 <210> SEQ ID NO 18 <211> LENGTH: 25 <212> TYPE: DNA <213> ORGANISM: Artificial Sequence <220> FEATURE: <223> OTHER INFORMATION: Description of Artificial  #Sequence: Synthetic       primers for PCR amplification of  #Vssc1 cDNAs. <220> FEATURE: <221> NAME/KEY: unsure <222> LOCATION: (11) <223> OTHER INFORMATION: N at any position in  #this sequence is A, C, G,       or T <400> SEQUENCE: 18 ggagbggbgg nckbggnckn gctca           #                   #               25 <210> SEQ ID NO 19 <211> LENGTH: 2100 <212> TYPE: PRT <213> ORGANISM: Drosophila melanogaster <400> SEQUENCE: 19 Met Thr Glu Asp Ser Asp Ser Ile Ser Glu Gl #u Glu Arg Ser Leu Phe   1               5  #                 10  #                 15 Arg Pro Phe Thr Arg Glu Ser Leu Val Gln Il #e Glu Gln Arg Ile Ala              20      #             25      #             30 Ala Glu His Glu Lys Gln Lys Glu Leu Glu Ar #g Lys Arg Ala Glu Gly          35          #         40          #         45 Glu Val Pro Arg Tyr Gly Arg Lys Lys Lys Gl #n Lys Glu Ile Arg Tyr      50              #     55              #     60 Asp Asp Glu Asp Glu Asp Glu Gly Pro Gln Pr #o Asp Pro Thr Leu Glu  65                  # 70                  # 75                  # 80 Gln Gly Val Pro Ile Pro Val Arg Leu Gln Gl #y Ser Phe Pro Pro Glu                  85  #                 90  #                 95 Leu Ala Ser Thr Pro Leu Glu Asp Ile Asp Pr #o Tyr Tyr Ser Asn Val             100       #           105       #           110 Leu Thr Phe Val Val Val Ser Lys Gly Lys As #p Ile Phe Arg Phe Ser         115           #       120           #       125 Ala Ser Lys Ala Met Trp Met Leu Asp Pro Ph #e Asn Pro Ile Arg Arg     130               #   135               #   140 Val Ala Ile Tyr Ile Leu Val His Pro Leu Ph #e Ser Leu Phe Ile Ile 145                 1 #50                 1 #55                 1 #60 Thr Thr Ile Leu Val Asn Cys Ile Leu Met Il #e Met Pro Thr Thr Pro                 165   #               170   #               175 Thr Val Glu Ser Thr Glu Val Ile Phe Thr Gl #y Ile Tyr Thr Phe Glu             180       #           185       #           190 Ser Ala Val Lys Val Met Ala Arg Gly Phe Il #e Leu Cys Pro Phe Thr         195           #       200           #       205 Tyr Leu Arg Asp Ala Trp Asn Trp Leu Asp Ph #e Val Val Ile Ala Leu     210               #   215               #   220 Ala Tyr Val Thr Met Gly Ile Asp Leu Gly As #n Leu Ala Ala Leu Arg 225                 2 #30                 2 #35                 2 #40 Thr Phe Arg Val Leu Arg Ala Leu Lys Thr Va #l Ala Ile Val Pro Gly                 245   #               250   #               255 Leu Lys Thr Ile Val Gly Ala Val Ile Glu Se #r Val Lys Asn Leu Arg             260       #           265       #           270 Asp Val Ile Ile Leu Thr Met Phe Ser Leu Se #r Val Phe Ala Leu Met         275           #       280           #       285 Gly Leu Gln Ile Tyr Met Gly Val Leu Thr Gl #u Lys Cys Ile Lys Lys     290               #   295               #   300 Phe Pro Leu Asp Gly Ser Trp Gly Asn Leu Th #r Asp Glu Asn Trp Asp 305                 3 #10                 3 #15                 3 #20 Tyr His Asn Arg Asn Ser Ser Asn Trp Tyr Se #r Glu Asp Glu Gly Ile                 325   #               330   #               335 Ser Phe Pro Leu Cys Gly Asn Ile Ser Gly Al #a Gly Gln Cys Asp Asp             340       #           345       #           350 Asp Tyr Val Cys Leu Gln Gly Phe Gly Pro As #n Pro Asn Tyr Gly Tyr         355           #       360           #       365 Thr Ser Phe Asp Ser Phe Gly Trp Ala Phe Le #u Ser Ala Phe Arg Leu     370               #   375               #   380 Met Thr Gln Asp Phe Trp Glu Asp Leu Tyr Gl #n Leu Val Leu Arg Ala 385                 3 #90                 3 #95                 4 #00 Ala Gly Pro Trp His Met Leu Phe Phe Ile Va #l Ile Ile Phe Leu Gly                 405   #               410   #               415 Ser Phe Tyr Leu Val Asn Leu Ile Leu Ala Il #e Val Ala Met Ser Tyr             420       #           425       #           430 Asp Glu Leu Gln Arg Lys Ala Glu Glu Glu Gl #u Ala Ala Glu Glu Glu         435           #       440           #       445 Ala Ile Arg Glu Ala Glu Glu Ala Ala Ala Al #a Lys Ala Ala Lys Leu     450               #   455               #   460 Glu Glu Arg Ala Asn Ala Gln Ala Gln Ala Al #a Ala Asp Ala Ala Ala 465                 4 #70                 4 #75                 4 #80 Ala Glu Glu Ala Ala Leu His Pro Glu Met Al #a Lys Ser Pro Thr Tyr                 485   #               490   #               495 Ser Cys Ile Ser Tyr Glu Leu Phe Val Gly Gl #y Glu Lys Gly Asn Asp             500       #           505       #           510 Asp Asn Asn Lys Glu Lys Met Ser Ile Arg Se #r Val Glu Val Glu Ser         515           #       520           #       525 Glu Ser Val Ser Val Ile Gln Arg Gln Pro Al #a Pro Thr Thr Ala His     530               #   535               #   540 Gln Ala Thr Lys Val Arg Lys Val Ser Thr Th #r Ser Leu Ser Leu Pro 545                 5 #50                 5 #55                 5 #60 Gly Ser Pro Phe Asn Ile Arg Arg Gly Ser Ar #g Ser Ser His Lys Tyr                 565   #               570   #               575 Thr Ile Arg Asn Gly Arg Gly Arg Phe Gly Il #e Pro Gly Ser Asp Arg             580       #           585       #           590 Lys Pro Leu Val Leu Ser Thr Tyr Gln Asp Al #a Gln Gln His Leu Pro         595           #       600           #       605 Tyr Ala Asp Asp Ser Asn Ala Val Thr Pro Me #t Ser Glu Glu Asn Gly     610               #   615               #   620 Ala Ile Ile Val Pro Val Tyr Tyr Gly Asn Le #u Gly Ser Arg His Ser 625                 6 #30                 6 #35                 6 #40 Ser Tyr Thr Ser His Gln Ser Arg Ile Ser Ty #r Thr Ser His Gly Asp                 645   #               650   #               655 Leu Leu Gly Gly Met Ala Val Met Gly Val Se #r Thr Met Thr Lys Glu             660       #           665       #           670 Ser Lys Leu Arg Asn Arg Asn Thr Arg Asn Gl #n Ser Val Gly Ala Thr         675           #       680           #       685 Asn Gly Gly Thr Thr Cys Leu Asp Thr Asn Hi #s Lys Leu Asp His Arg     690               #   695               #   700 Asp Tyr Glu Ile Gly Leu Glu Cys Thr Asp Gl #u Ala Gly Lys Ile Lys 705                 7 #10                 7 #15                 7 #20 His His Asp Asn Pro Phe Ile Glu Pro Val Gl #n Thr Gln Thr Val Val                 725   #               730   #               735 Asp Met Lys Asp Val Met Val Leu Asn Asp Il #e Ile Glu Gln Ala Ala             740       #           745       #           750 Gly Arg His Ser Arg Ala Ser Asp Arg Gly Gl #u Asp Asp Asp Glu Asp         755           #       760           #       765 Gly Pro Thr Phe Lys Asp Lys Ala Leu Glu Va #l Ile Leu Lys Gly Ile     770               #   775               #   780 Asp Val Phe Cys Val Trp Asp Cys Cys Trp Va #l Trp Leu Lys Phe Gln 785                 7 #90                 7 #95                 8 #00 Glu Trp Val Ser Leu Ile Val Phe Asp Pro Ph #e Val Glu Leu Phe Ile                 805   #               810   #               815 Thr Leu Cys Ile Val Val Asn Thr Met Phe Me #t Ala Met Asp His His             820       #           825       #           830 Asp Met Asn Lys Glu Met Glu Arg Val Leu Ly #s Ser Gly Asn Tyr Phe         835           #       840           #       845 Phe Thr Ala Thr Phe Ala Ile Glu Ala Thr Me #t Lys Leu Met Ala Met     850               #   855               #   860 Ser Pro Lys Tyr Tyr Phe Gln Glu Gly Trp As #n Ile Phe Asp Phe Ile 865                 8 #70                 8 #75                 8 #80 Ile Val Ala Leu Ser Leu Leu Glu Leu Gly Le #u Glu Gly Val Gln Gly                 885   #               890   #               895 Leu Ser Val Leu Arg Ser Phe Arg Leu Leu Ar #g Val Phe Lys Leu Ala             900       #           905       #           910 Lys Ser Trp Pro Thr Leu Asn Leu Leu Ile Se #r Ile Met Gly Arg Thr         915           #       920           #       925 Met Gly Ala Leu Gly Asn Leu Thr Phe Val Le #u Cys Ile Ile Ile Phe     930               #   935               #   940 Ile Phe Ala Val Met Gly Met Gln Leu Phe Gl #y Lys Asn Tyr His Asp 945                 9 #50                 9 #55                 9 #60 His Lys Asp Arg Phe Pro Asp Gly Asp Leu Pr #o Arg Trp Asn Phe Thr                 965   #               970   #               975 Asp Phe Met His Ser Phe Met Ile Val Phe Ar #g Val Leu Cys Gly Glu             980       #           985       #           990 Trp Ile Glu Ser Met Trp Asp Cys Met Tyr Va #l Gly Asp Val Ser Cys         995           #       1000           #      1005 Ile Pro Phe Phe Leu Ala Thr Val Val Ile Gl #y Asn Leu Val Val Leu     1010              #   1015               #  1020 Asn Leu Phe Leu Ala Leu Leu Leu Ser Asn Ph #e Gly Ser Ser Ser Leu 1025                1030 #                1035  #               1040 Ser Ala Pro Thr Ala Asp Asn Asp Thr Asn Ly #s Ile Ala Glu Ala Phe                 1045  #               1050   #              1055 Asn Arg Ile Gly Arg Phe Lys Ser Trp Val Ly #s Arg Asn Ile Ala Asp             1060      #           1065       #          1070 Cys Phe Lys Leu Ile Arg Asn Lys Leu Thr As #n Gln Ile Ser Asp Gln         1075          #       1080           #      1085 Pro Ser Glu His Gly Asp Asn Glu Leu Glu Le #u Gly His Asp Glu Ile     1090              #   1095               #  1100 Leu Ala Asp Gly Leu Ile Lys Lys Gly Ile Ly #s Glu Gln Thr Gln Leu 1105                1110 #                1115  #               1120 Glu Val Ala Ile Gly Asp Gly Met Glu Phe Th #r Ile His Gly Asp Met                 1125  #               1130   #              1135 Lys Asn Asn Lys Pro Lys Lys Ser Lys Tyr Le #u Asn Asn Ala Thr Asp             1140      #           1145       #          1150 Asp Asp Thr Ala Ser Ile Asn Ser Tyr Gly Se #r His Lys Asn Arg Pro         1155          #       1160           #      1165 Phe Lys Asp Glu Ser His Lys Gly Ser Ala Gl #u Thr Met Glu Gly Glu     1170              #   1175               #  1180 Glu Lys Arg Asp Ala Ser Lys Glu Asp Leu Gl #y Leu Asp Glu Glu Leu 1185                1190 #                1195  #               1200 Asp Glu Glu Gly Glu Cys Glu Glu Gly Pro Le #u Asp Gly Asp Ile Ile                 1205  #               1210   #              1215 Ile His Ala His Asp Glu Asp Ile Leu Asp Gl #u Tyr Pro Ala Asp Cys             1220      #           1225       #          1230 Cys Pro Asp Ser Tyr Tyr Lys Lys Phe Pro Il #e Leu Ala Gly Asp Asp         1235          #       1240           #      1245 Asp Ser Pro Phe Trp Gln Gly Trp Gly Asn Le #u Arg Leu Lys Thr Phe     1250              #   1255               #  1260 Arg Leu Ile Glu Asp Lys Tyr Phe Glu Thr Al #a Val Ile Thr Met Ile 1265                1270 #                1275  #               1280 Leu Met Ser Ser Leu Ala Leu Ala Leu Glu As #p Val His Leu Pro Gln                 1285  #               1290   #              1295 Arg Pro Ile Leu Gln Asp Ile Leu Tyr Tyr Me #t Asp Arg Ile Phe Thr             1300      #           1305       #          1310 Val Ile Phe Phe Leu Glu Met Leu Ile Lys Tr #p Leu Ala Leu Gly Phe         1315          #       1320           #      1325 Lys Val Tyr Leu Thr Asn Ala Trp Cys Trp Le #u Asp Phe Val Ile Val     1330              #   1335               #  1340 Met Val Ser Leu Ile Asn Phe Val Ala Ser Le #u Val Gly Ala Gly Gly 1345                1350 #                1355  #               1360 Ile Gln Ala Phe Lys Thr Met Arg Thr Leu Ar #g Ala Leu Arg Pro Leu                 1365  #               1370   #              1375 Arg Ala Met Ser Arg Met Gln Gly Met Arg Va #l Val Val Asn Ala Leu             1380      #           1385       #          1390 Val Gln Ala Ile Pro Ser Ile Phe Asn Val Le #u Leu Val Cys Leu Ile         1395          #       1400           #      1405 Phe Trp Leu Ile Phe Ala Ile Met Gly Val Gl #n Leu Phe Ala Gly Lys     1410              #   1415               #  1420 Tyr Phe Lys Cys Glu Asp Met Asn Gly Thr Ly #s Leu Ser His Glu Ile 1425                1430 #                1435  #               1440 Ile Pro Asn Arg Asn Ala Cys Glu Ser Glu As #n Tyr Thr Trp Val Asn                 1445  #               1450   #              1455 Ser Ala Met Asn Phe Asp His Val Gly Asn Al #a Tyr Leu Cys Leu Phe             1460      #           1465       #          1470 Gln Val Ala Thr Phe Lys Gly Trp Ile Gln Il #e Met Asn Asp Ala Ile         1475          #       1480           #      1485 Asp Ser Arg Glu Val Asp Lys Gln Pro Ile Ar #g Glu Thr Asn Ile Tyr     1490              #   1495               #  1500 Met Tyr Leu Tyr Phe Val Phe Phe Ile Ile Ph #e Gly Ser Phe Phe Thr 1505                1510 #                1515  #               1520 Leu Asn Leu Phe Ile Gly Val Ile Ile Asp As #n Phe Asn Glu Gln Lys                 1525  #               1530   #              1535 Lys Lys Ala Gly Gly Ser Leu Glu Met Phe Me #t Thr Glu Asp Gln Lys             1540      #           1545       #          1550 Lys Tyr Tyr Ser Ala Met Lys Lys Met Gly Se #r Lys Lys Pro Leu Lys         1555          #       1560           #      1565 Ala Ile Pro Arg Pro Arg Trp Arg Pro Gln Al #a Ile Val Phe Glu Ile     1570              #   1575               #  1580 Val Thr Asp Lys Lys Phe Asp Ile Ile Ile Me #t Leu Phe Ile Gly Leu 1585                1590 #                1595  #               1600 Asn Met Phe Thr Met Thr Leu Asp Arg Tyr As #p Ala Ser Asp Thr Tyr                 1605  #               1610   #              1615 Asn Ala Val Leu Asp Tyr Leu Asn Ala Ile Ph #e Val Val Ile Phe Ser             1620      #           1625       #          1630 Ser Glu Cys Leu Leu Lys Ile Phe Ala Leu Ar #g Tyr His Tyr Phe Ile         1635          #       1640           #      1645 Glu Pro Trp Asn Leu Phe Asp Val Val Val Va #l Ile Leu Ser Ile Leu     1650              #   1655               #  1660 Gly Leu Val Leu Ser Asp Ile Ile Glu Lys Ty #r Phe Val Ser Pro Thr 1665                1670 #                1675  #               1680 Leu Leu Arg Val Val Arg Val Ala Lys Val Gl #y Arg Val Leu Arg Leu                 1685  #               1690   #              1695 Val Lys Gly Ala Lys Gly Ile Arg Thr Leu Le #u Phe Ala Leu Ala Met             1700      #           1705       #          1710 Ser Leu Pro Ala Leu Phe Asn Ile Cys Leu Le #u Leu Phe Leu Val Met         1715          #       1720           #      1725 Phe Ile Phe Ala Ile Phe Gly Met Ser Phe Ph #e Met His Val Lys Glu     1730              #   1735               #  1740 Lys Ser Gly Ile Asn Asp Val Tyr Asn Phe Ly #s Thr Phe Gly Gln Ser 1745                1750 #                1755  #               1760 Met Ile Leu Leu Phe Gln Met Ser Thr Ser Al #a Gly Trp Asp Gly Val                 1765  #               1770   #              1775 Leu Asp Ala Ile Ile Asn Glu Glu Ala Cys As #p Pro Pro Asp Asn Asp             1780      #           1785       #          1790 Lys Gly Tyr Pro Gly Asn Cys Gly Ser Ala Th #r Val Gly Ile Thr Phe         1795          #       1800           #      1805 Leu Leu Ser Tyr Leu Val Ile Ser Phe Leu Il #e Val Ile Asn Met Tyr     1810              #   1815               #  1820 Ile Ala Val Ile Leu Glu Asn Tyr Ser Gln Al #a Thr Glu Asp Val Gln 1825                1830 #                1835  #               1840 Glu Gly Leu Thr Asp Asp Asp Tyr Asp Met Ty #r Tyr Glu Ile Trp Gln                 1845  #               1850   #              1855 Gln Phe Asp Pro Glu Gly Thr Gln Tyr Ile Ar #g Tyr Asp Gln Leu Ser             1860      #           1865       #          1870 Glu Phe Leu Asp Val Leu Glu Pro Pro Leu Gl #n Ile His Lys Pro Asn         1875          #       1880           #      1885 Lys Tyr Lys Ile Ile Ser Met Asp Ile Pro Il #e Cys Arg Gly Asp Leu     1890              #   1895               #  1900 Met Tyr Cys Val Asp Ile Leu Asp Ala Leu Th #r Lys Asp Phe Phe Ala 1905                1910 #                1915  #               1920 Arg Lys Gly Asn Pro Ile Glu Glu Thr Gly Gl #u Ile Gly Glu Ile Ala                 1925  #               1930   #              1935 Ala Arg Pro Asp Thr Glu Gly Tyr Glu Pro Va #l Ser Ser Thr Leu Trp             1940      #           1945       #          1950 Arg Gln Arg Glu Glu Tyr Cys Ala Arg Leu Il #e Gln His Ala Trp Arg         1955          #       1960           #      1965 Lys His Lys Ala Arg Gly Glu Gly Gly Gly Se #r Phe Glu Pro Asp Thr     1970              #   1975               #  1980 Asp His Gly Asp Gly Gly Asp Pro Asp Ala Gl #y Asp Pro Ala Pro Asp 1985                1990 #                1995  #               2000 Glu Ala Thr Asp Gly Asp Ala Pro Ala Gly Gl #y Asp Gly Ser Val Asn                 2005  #               2010   #              2015 Gly Thr Ala Glu Gly Ala Ala Asp Ala Asp Gl #u Ser Asn Val Asn Ser             2020      #           2025       #          2030 Pro Gly Glu Asp Ala Ala Ala Ala Ala Ala Al #a Ala Ala Ala Ala Ala         2035          #       2040           #      2045 Ala Ala Gly Thr Thr Thr Ala Gly Ser Pro Gl #y Ala Gly Ser Ala Gly     2050              #   2055               #  2060 Arg Gln Thr Ala Val Leu Val Glu Ser Asp Gl #y Phe Val Thr Lys Asn 2065                2070 #                2075  #               2080 Gly His Lys Val Val Ile His Ser Arg Ser Pr #o Ser Ile Thr Ser Arg                 2085  #               2090   #              2095 Thr Ala Asp Val             2100 

What is claimed is:
 1. A method of screening a chemical agent for the ability of the chemical agent to modify sodium channel function, said method comprising: introducing an isolated nucleic acid molecule encoding a voltage-sensitive sodium channel of Musca domestica, wherein said nucleic acid molecule hybridizes to a nucleic acid molecule having a nucleotide sequence according to SEQ. ID. NOS: 1 or 2 at 42° C., with 5×SSPC and 50 percent formamide with washing at 65° C. with 0.5×SSPC into a eukaryotic host cell in vitro; expressing said voltage-sensitive sodium channel encoded said nucleic acid molecule in the host cell so as to result in the functional expression of said voltage-sensitive sodium channel in the host cell; exposing the host cell to a chemical agent; and evaluating the exposed host cell to determine if the chemical agent modifies sodium channel function.
 2. The method of claim 1 wherein the host cell is a Xenopus oocyte.
 3. The method of claim 1 wherein the host cell is an insect cell line.
 4. The method of claim 3 wherein said insect cell line is selected from the group consisting of a Drosophila Schneider cell line, a Drosophila K_(c) cell line, an Sf9 cell line, and a High Five® cell line.
 5. The method of claim 1 wherein the evaluation comprises monitoring sodium transport through said voltage-sensitive sodium channel.
 6. The method of claim 1 wherein the evaluation comprises monitoring quanidinium transport through said voltage-sensitive sodium channel.
 7. The method according to claim 1, wherein said voltage-sensitive sodium channel confers susceptibility to an insecticide in Musca domestica.
 8. The method according to claim 7, wherein said nucleotide sequence as shown in SEQ ID NO:1.
 9. The method according to claim 7, wherein said nucleic acid molecule encodes an amino acid sequence as shown in SEQ ID NO:3.
 10. The method according to claim 1, wherein said voltage-sensitive sodium channel confers resistance to an insecticide in Musca domestica.
 11. The method according to claim 10, wherein said voltage-sensitive sodium channel is encoded by the nucleotide sequence as shown in SEQ ID NO:2.
 12. The method according to claim 1, wherein said nucleic acid molecule encodes an amino acid sequence as shown in SEQ ID NO:4.
 13. A method of screening a chemical agent for the ability of the chemical agent to modify sodium channel function, said method comprising: introducing a first nucleic acid molecule encoding a voltage-sensitive sodium channel of Musca domestica and a second nucleic acid molecule encoding a tip E protein into a eukaryotic host cell in vitro, wherein said first nucleic acid molecule hybridizes to a nucleic acid molecule having a nucleotide sequence according to SEQ ID NOS: 1 or 2 at 42° C., with 5×SSPC and 50 percent formamide with washing at 65° C. with 0.5×SSPC; allowing said host cell to coexpress said first nucleic acid molecule and said second nucleic acid molecule so as to result in the functional expression of said voltage-sensitive sodium channel in the host cell; exposing the host cell to a chemical agent; and evaluating the exposed host cell to determine if the chemical agent modifies sodium channel function.
 14. The method of claim 13 wherein the host cell is a Xenopus oocyte.
 15. The method of claim 13 wherein the host cell is an insect cell line.
 16. The method of claim 15 wherein said insect cell line is selected from the group consisting of a Drosophila Schneider cell line, a Drosophila K_(c) cell line, an Sf9 cell line, and a High Five® cell line.
 17. The method of claim 13 wherein the evaluation comprises monitoring sodium transport through said voltage-sensitive sodium channel.
 18. The method of claim 13 wherein the evaluation comprises monitoring quanidinium transport through said voltage-sensitive sodium channel. 